---
_id: '15018'
abstract:
- lang: eng
text: The epitaxial growth of a strained Ge layer, which is a promising candidate
for the channel material of a hole spin qubit, has been demonstrated on 300 mm
Si wafers using commercially available Si0.3Ge0.7 strain relaxed buffer (SRB)
layers. The assessment of the layer and the interface qualities for a buried strained
Ge layer embedded in Si0.3Ge0.7 layers is reported. The XRD reciprocal space mapping
confirmed that the reduction of the growth temperature enables the 2-dimensional
growth of the Ge layer fully strained with respect to the Si0.3Ge0.7. Nevertheless,
dislocations at the top and/or bottom interface of the Ge layer were observed
by means of electron channeling contrast imaging, suggesting the importance of
the careful dislocation assessment. The interface abruptness does not depend on
the selection of the precursor gases, but it is strongly influenced by the growth
temperature which affects the coverage of the surface H-passivation. The mobility
of 2.7 × 105 cm2/Vs is promising, while the low percolation density of 3 × 1010
/cm2 measured with a Hall-bar device at 7 K illustrates the high quality of the
heterostructure thanks to the high Si0.3Ge0.7 SRB quality.
acknowledgement: The Ge project received funding from the European Union's Horizon
Europe programme under the Grant Agreement 101069515 – IGNITE. Siltronic AG is acknowledged
for providing the SRB wafers. This work was supported by Imec's Industrial Affiliation
Program on Quantum Computing.
article_number: '108231'
article_processing_charge: No
article_type: original
author:
- first_name: Yosuke
full_name: Shimura, Yosuke
last_name: Shimura
- first_name: Clement
full_name: Godfrin, Clement
last_name: Godfrin
- first_name: Andriy
full_name: Hikavyy, Andriy
last_name: Hikavyy
- first_name: Roy
full_name: Li, Roy
last_name: Li
- first_name: Juan L
full_name: Aguilera Servin, Juan L
id: 2A67C376-F248-11E8-B48F-1D18A9856A87
last_name: Aguilera Servin
orcid: 0000-0002-2862-8372
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
- first_name: Paola
full_name: Favia, Paola
last_name: Favia
- first_name: Han
full_name: Han, Han
last_name: Han
- first_name: Danny
full_name: Wan, Danny
last_name: Wan
- first_name: Kristiaan
full_name: de Greve, Kristiaan
last_name: de Greve
- first_name: Roger
full_name: Loo, Roger
last_name: Loo
citation:
ama: Shimura Y, Godfrin C, Hikavyy A, et al. Compressively strained epitaxial Ge
layers for quantum computing applications. Materials Science in Semiconductor
Processing. 2024;174(5). doi:10.1016/j.mssp.2024.108231
apa: Shimura, Y., Godfrin, C., Hikavyy, A., Li, R., Aguilera Servin, J. L., Katsaros,
G., … Loo, R. (2024). Compressively strained epitaxial Ge layers for quantum computing
applications. Materials Science in Semiconductor Processing. Elsevier.
https://doi.org/10.1016/j.mssp.2024.108231
chicago: Shimura, Yosuke, Clement Godfrin, Andriy Hikavyy, Roy Li, Juan L Aguilera
Servin, Georgios Katsaros, Paola Favia, et al. “Compressively Strained Epitaxial
Ge Layers for Quantum Computing Applications.” Materials Science in Semiconductor
Processing. Elsevier, 2024. https://doi.org/10.1016/j.mssp.2024.108231.
ieee: Y. Shimura et al., “Compressively strained epitaxial Ge layers for
quantum computing applications,” Materials Science in Semiconductor Processing,
vol. 174, no. 5. Elsevier, 2024.
ista: Shimura Y, Godfrin C, Hikavyy A, Li R, Aguilera Servin JL, Katsaros G, Favia
P, Han H, Wan D, de Greve K, Loo R. 2024. Compressively strained epitaxial Ge
layers for quantum computing applications. Materials Science in Semiconductor
Processing. 174(5), 108231.
mla: Shimura, Yosuke, et al. “Compressively Strained Epitaxial Ge Layers for Quantum
Computing Applications.” Materials Science in Semiconductor Processing,
vol. 174, no. 5, 108231, Elsevier, 2024, doi:10.1016/j.mssp.2024.108231.
short: Y. Shimura, C. Godfrin, A. Hikavyy, R. Li, J.L. Aguilera Servin, G. Katsaros,
P. Favia, H. Han, D. Wan, K. de Greve, R. Loo, Materials Science in Semiconductor
Processing 174 (2024).
date_created: 2024-02-22T14:10:40Z
date_published: 2024-02-20T00:00:00Z
date_updated: 2024-02-26T10:36:35Z
day: '20'
ddc:
- '530'
department:
- _id: GeKa
- _id: NanoFab
doi: 10.1016/j.mssp.2024.108231
has_accepted_license: '1'
intvolume: ' 174'
issue: '5'
keyword:
- Mechanical Engineering
- Mechanics of Materials
- Condensed Matter Physics
- General Materials Science
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1016/j.mssp.2024.108231
month: '02'
oa: 1
oa_version: Published Version
project:
- _id: 34c0acea-11ca-11ed-8bc3-8775e10fd452
grant_number: '101069515'
name: Integrated GermaNIum quanTum tEchnology
publication: Materials Science in Semiconductor Processing
publication_identifier:
issn:
- 1369-8001
publication_status: epub_ahead
publisher: Elsevier
quality_controlled: '1'
status: public
title: Compressively strained epitaxial Ge layers for quantum computing applications
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 174
year: '2024'
...
---
APC_amount: '12345'
_id: '14793'
abstract:
- lang: eng
text: Superconductor/semiconductor hybrid devices have attracted increasing interest
in the past years. Superconducting electronics aims to complement semiconductor
technology, while hybrid architectures are at the forefront of new ideas such
as topological superconductivity and protected qubits. In this work, we engineer
the induced superconductivity in two-dimensional germanium hole gas by varying
the distance between the quantum well and the aluminum. We demonstrate a hard
superconducting gap and realize an electrically and flux tunable superconducting
diode using a superconducting quantum interference device (SQUID). This allows
to tune the current phase relation (CPR), to a regime where single Cooper pair
tunneling is suppressed, creating a sin(2y) CPR. Shapiro experiments complement
this interpretation and the microwave drive allows to create a diode with ≈ 100%
efficiency. The reported results open up the path towards integration of spin
qubit devices, microwave resonators and (protected) superconducting qubits on the
same silicon technology compatible platform.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: "We acknowledge Alexander Brinkmann, Alessandro Crippa, Francesco
Giazotto, Andrew Higginbotham, Andrea Iorio, Giordano Scappucci, Christian Schonenberger,
and Lukas Splitthoff for helpful discussions. We thank Marcel Verheijen for the
support in the TEM analysis. This research and related results were made possible
with the support of the NOMIS\r\nFoundation. It was supported by the Scientific
Service Units of ISTA through resources provided by the MIBA Machine Shop and the
nanofabrication facility, the European Union’s Horizon 2020 research andinnovation
programme under Grant Agreement No 862046, the HORIZONRIA\r\n101069515 project,
the European Innovation Council Pathfinder grant no. 101115315 (QuKiT), and the
FWF Projects #P-32235, #P-36507 and #F-8606. For the purpose of open access, the
authors have applied a CC BY public copyright licence to any Author Accepted Manuscript
version arising from this submission. R.S.S. acknowledges Spanish CM “Talento Program\"\r\nProject
No. 2022-T1/IND-24070. J.J. acknowledges European Research Council TOCINA 834290."
article_number: '169'
article_processing_charge: Yes
article_type: original
author:
- first_name: Marco
full_name: Valentini, Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
- first_name: Oliver
full_name: Sagi, Oliver
id: 71616374-A8E9-11E9-A7CA-09ECE5697425
last_name: Sagi
- first_name: Levon
full_name: Baghumyan, Levon
id: 7aa1f788-b527-11ee-aa9e-e6111a79e0c7
last_name: Baghumyan
- first_name: Thijs
full_name: de Gijsel, Thijs
id: a0ece13c-b527-11ee-929d-bad130106eee
last_name: de Gijsel
- first_name: Jason
full_name: Jung, Jason
id: 4C9ACE7A-F248-11E8-B48F-1D18A9856A87
last_name: Jung
- first_name: Stefano
full_name: Calcaterra, Stefano
last_name: Calcaterra
- first_name: Andrea
full_name: Ballabio, Andrea
last_name: Ballabio
- first_name: Juan L
full_name: Aguilera Servin, Juan L
id: 2A67C376-F248-11E8-B48F-1D18A9856A87
last_name: Aguilera Servin
orcid: 0000-0002-2862-8372
- first_name: Kushagra
full_name: Aggarwal, Kushagra
id: b22ab905-3539-11eb-84c3-fc159dcd79cb
last_name: Aggarwal
orcid: 0000-0001-9985-9293
- first_name: Marian
full_name: Janik, Marian
id: 396A1950-F248-11E8-B48F-1D18A9856A87
last_name: Janik
- first_name: Thomas
full_name: Adletzberger, Thomas
id: 38756BB2-F248-11E8-B48F-1D18A9856A87
last_name: Adletzberger
- first_name: Rubén
full_name: Seoane Souto, Rubén
last_name: Seoane Souto
- first_name: Martin
full_name: Leijnse, Martin
last_name: Leijnse
- first_name: Jeroen
full_name: Danon, Jeroen
last_name: Danon
- first_name: Constantin
full_name: Schrade, Constantin
last_name: Schrade
- first_name: Erik
full_name: Bakkers, Erik
last_name: Bakkers
- first_name: Daniel
full_name: Chrastina, Daniel
last_name: Chrastina
- first_name: Giovanni
full_name: Isella, Giovanni
last_name: Isella
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
citation:
ama: Valentini M, Sagi O, Baghumyan L, et al. Parity-conserving Cooper-pair transport
and ideal superconducting diode in planar germanium. Nature Communications.
2024;15. doi:10.1038/s41467-023-44114-0
apa: Valentini, M., Sagi, O., Baghumyan, L., de Gijsel, T., Jung, J., Calcaterra,
S., … Katsaros, G. (2024). Parity-conserving Cooper-pair transport and ideal superconducting
diode in planar germanium. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-023-44114-0
chicago: Valentini, Marco, Oliver Sagi, Levon Baghumyan, Thijs de Gijsel, Jason
Jung, Stefano Calcaterra, Andrea Ballabio, et al. “Parity-Conserving Cooper-Pair
Transport and Ideal Superconducting Diode in Planar Germanium.” Nature Communications.
Springer Nature, 2024. https://doi.org/10.1038/s41467-023-44114-0.
ieee: M. Valentini et al., “Parity-conserving Cooper-pair transport and ideal
superconducting diode in planar germanium,” Nature Communications, vol.
15. Springer Nature, 2024.
ista: Valentini M, Sagi O, Baghumyan L, de Gijsel T, Jung J, Calcaterra S, Ballabio
A, Aguilera Servin JL, Aggarwal K, Janik M, Adletzberger T, Seoane Souto R, Leijnse
M, Danon J, Schrade C, Bakkers E, Chrastina D, Isella G, Katsaros G. 2024. Parity-conserving
Cooper-pair transport and ideal superconducting diode in planar germanium. Nature
Communications. 15, 169.
mla: Valentini, Marco, et al. “Parity-Conserving Cooper-Pair Transport and Ideal
Superconducting Diode in Planar Germanium.” Nature Communications, vol.
15, 169, Springer Nature, 2024, doi:10.1038/s41467-023-44114-0.
short: M. Valentini, O. Sagi, L. Baghumyan, T. de Gijsel, J. Jung, S. Calcaterra,
A. Ballabio, J.L. Aguilera Servin, K. Aggarwal, M. Janik, T. Adletzberger, R.
Seoane Souto, M. Leijnse, J. Danon, C. Schrade, E. Bakkers, D. Chrastina, G. Isella,
G. Katsaros, Nature Communications 15 (2024).
dataavailabilitystatement: All experimental data included in this work are available
at https://zenodo.org/records/10119346.
date_created: 2024-01-14T23:00:56Z
date_published: 2024-01-02T00:00:00Z
date_updated: 2026-02-26T11:39:00Z
day: '02'
ddc:
- '530'
department:
- _id: GeKa
doi: 10.1038/s41467-023-44114-0
ec_funded: 1
external_id:
oaworkID:
- w4390499170
pmid:
- '38167818'
file:
- access_level: open_access
checksum: ef79173b45eeaf984ffa61ef2f8a52ab
content_type: application/pdf
creator: dernst
date_created: 2024-01-17T11:03:00Z
date_updated: 2024-01-17T11:03:00Z
file_id: '14825'
file_name: 2024_NatureComm_Valentini.pdf
file_size: 2336595
relation: main_file
success: 1
file_date_updated: 2024-01-17T11:03:00Z
has_accepted_license: '1'
intvolume: ' 15'
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
oaworkID: 1
pmid: 1
project:
- _id: 237E5020-32DE-11EA-91FC-C7463DDC885E
call_identifier: H2020
grant_number: '862046'
name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS
- _id: 34c0acea-11ca-11ed-8bc3-8775e10fd452
grant_number: '101069515'
name: Integrated GermaNIum quanTum tEchnology
- _id: bdc2ca30-d553-11ed-ba76-cf164a5bb811
grant_number: '101115315'
name: Quantum bits with Kitaev Transmons
- _id: 237B3DA4-32DE-11EA-91FC-C7463DDC885E
call_identifier: FWF
grant_number: P32235
name: Towards scalable hut wire quantum devices
- _id: bd8bd29e-d553-11ed-ba76-f0070d4b237a
grant_number: P36507
name: Merging spin and superconducting qubits in planar Ge
- _id: 34a66131-11ca-11ed-8bc3-a31681c6b03e
grant_number: F8606
name: Conventional and unconventional topological superconductors
publication: Nature Communications
publication_identifier:
eissn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
researchdata_availability: yes
scopus_import: '1'
status: public
supplementarymaterial: yes
title: Parity-conserving Cooper-pair transport and ideal superconducting diode in
planar germanium
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 15
year: '2024'
...
---
_id: '13119'
abstract:
- lang: eng
text: A density wave (DW) is a fundamental type of long-range order in quantum matter
tied to self-organization into a crystalline structure. The interplay of DW order
with superfluidity can lead to complex scenarios that pose a great challenge to
theoretical analysis. In the past decades, tunable quantum Fermi gases have served
as model systems for exploring the physics of strongly interacting fermions, including
most notably magnetic ordering1, pairing and superfluidity2, and the crossover
from a Bardeen–Cooper–Schrieffer superfluid to a Bose–Einstein condensate3. Here,
we realize a Fermi gas featuring both strong, tunable contact interactions and
photon-mediated, spatially structured long-range interactions in a transversely
driven high-finesse optical cavity. Above a critical long-range interaction strength,
DW order is stabilized in the system, which we identify via its superradiant light-scattering
properties. We quantitatively measure the variation of the onset of DW order as
the contact interaction is varied across the Bardeen–Cooper–Schrieffer superfluid
and Bose–Einstein condensate crossover, in qualitative agreement with a mean-field
theory. The atomic DW susceptibility varies over an order of magnitude upon tuning
the strength and the sign of the long-range interactions below the self-ordering
threshold, demonstrating independent and simultaneous control over the contact
and long-range interactions. Therefore, our experimental setup provides a fully
tunable and microscopically controllable platform for the experimental study of
the interplay of superfluidity and DW order.
acknowledgement: Open access funding provided by EPFL Lausanne.We acknowledge discussions
with T. Donner and T. Esslinger. We thank G. del Pace and T. Bühler for their assistance
in the final stages of the experiment. We acknowledge funding from the European
Research Council under the European Union Horizon 2020 Research and Innovation Programme
(Grant no. 714309) and the Swiss National Science Foundation (Grant no. 184654).
F.M. acknowledges financial support from the Austrian Science Fund (Stand-Alone
Project P 35891-N).
article_processing_charge: Yes (via OA deal)
article_type: original
author:
- first_name: Victor
full_name: Helson, Victor
last_name: Helson
- first_name: Timo
full_name: Zwettler, Timo
last_name: Zwettler
- first_name: Farokh
full_name: Mivehvar, Farokh
last_name: Mivehvar
- first_name: Elvia
full_name: Colella, Elvia
last_name: Colella
- first_name: Kevin Etienne Robert
full_name: Roux, Kevin Etienne Robert
id: 53f93ea2-803f-11ed-ab7e-b283135794ef
last_name: Roux
- first_name: Hideki
full_name: Konishi, Hideki
last_name: Konishi
- first_name: Helmut
full_name: Ritsch, Helmut
last_name: Ritsch
- first_name: Jean Philippe
full_name: Brantut, Jean Philippe
last_name: Brantut
citation:
ama: Helson V, Zwettler T, Mivehvar F, et al. Density-wave ordering in a unitary
Fermi gas with photon-mediated interactions. Nature. 2023;618:716-720.
doi:10.1038/s41586-023-06018-3
apa: Helson, V., Zwettler, T., Mivehvar, F., Colella, E., Roux, K. E. R., Konishi,
H., … Brantut, J. P. (2023). Density-wave ordering in a unitary Fermi gas with
photon-mediated interactions. Nature. Springer Nature. https://doi.org/10.1038/s41586-023-06018-3
chicago: Helson, Victor, Timo Zwettler, Farokh Mivehvar, Elvia Colella, Kevin Etienne
Robert Roux, Hideki Konishi, Helmut Ritsch, and Jean Philippe Brantut. “Density-Wave
Ordering in a Unitary Fermi Gas with Photon-Mediated Interactions.” Nature.
Springer Nature, 2023. https://doi.org/10.1038/s41586-023-06018-3.
ieee: V. Helson et al., “Density-wave ordering in a unitary Fermi gas with
photon-mediated interactions,” Nature, vol. 618. Springer Nature, pp. 716–720,
2023.
ista: Helson V, Zwettler T, Mivehvar F, Colella E, Roux KER, Konishi H, Ritsch H,
Brantut JP. 2023. Density-wave ordering in a unitary Fermi gas with photon-mediated
interactions. Nature. 618, 716–720.
mla: Helson, Victor, et al. “Density-Wave Ordering in a Unitary Fermi Gas with Photon-Mediated
Interactions.” Nature, vol. 618, Springer Nature, 2023, pp. 716–20, doi:10.1038/s41586-023-06018-3.
short: V. Helson, T. Zwettler, F. Mivehvar, E. Colella, K.E.R. Roux, H. Konishi,
H. Ritsch, J.P. Brantut, Nature 618 (2023) 716–720.
date_created: 2023-06-04T22:01:03Z
date_published: 2023-06-22T00:00:00Z
date_updated: 2023-11-14T13:02:50Z
day: '22'
ddc:
- '530'
department:
- _id: GeKa
doi: 10.1038/s41586-023-06018-3
external_id:
isi:
- '001001139300008'
file:
- access_level: open_access
checksum: 4887a296e3b6f54e8c0b946cbfd24f49
content_type: application/pdf
creator: dernst
date_created: 2023-11-14T13:00:19Z
date_updated: 2023-11-14T13:00:19Z
file_id: '14534'
file_name: 2023_Nature_Helson.pdf
file_size: 8156497
relation: main_file
success: 1
file_date_updated: 2023-11-14T13:00:19Z
has_accepted_license: '1'
intvolume: ' 618'
isi: 1
language:
- iso: eng
month: '06'
oa: 1
oa_version: Published Version
page: 716-720
publication: Nature
publication_identifier:
eissn:
- 1476-4687
issn:
- 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Density-wave ordering in a unitary Fermi gas with photon-mediated interactions
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 618
year: '2023'
...
---
_id: '13286'
abstract:
- lang: eng
text: Semiconductor-superconductor hybrid systems are the harbour of many intriguing
mesoscopic phenomena. This material combination leads to spatial variations of
the superconducting properties, which gives rise to Andreev bound states (ABSs).
Some of these states might exhibit remarkable properties that render them highly
desirable for topological quantum computing. The most prominent and hunted of
such states are Majorana zero modes (MZMs), quasiparticles equals to their own
quasiparticles that they follow non-abelian statistics. In this thesis, we first
introduce the general framework of such hybrid systems and, then, we unveil a
series of mesoscopic phenomena that we discovered. Firstly, we show tunneling
spectroscopy experiments on full-shell nanowires (NWs) showing that unwanted quantum-dot
states coupled to superconductors (Yu-Shiba-Rusinov states) can mimic MZMs signatures.
Then, we introduce a novel protocol which allowed the integration of tunneling
spectroscopy with Coulomb spectroscopy within the same device. Employing this
approach on both full-shell NWs and partial-shell NWs, we demonstrated that longitudinally
confined states reveal charge transport phenomenology similar to the one expected
for MZMs. These findings shed light on the intricate interplay between superconductivity
and quantum confinement, which brought us to explore another material platform,
i.e. a two-dimensional Germanium hole gas. After developing a robust way to induce
superconductivity in such system, we showed how to engineer the proximity effect
and we revealed a superconducting hard gap. Finally, we created a superconducting
radio frequency driven ideal diode and a generator of non-sinusoidal current-phase
relations. Our results open the path for the exploration of protected superconducting
qubits and more complex hybrid devices in planar Germanium, like Kitaev chains
and hybrid qubit devices.
acknowledged_ssus:
- _id: NanoFab
- _id: M-Shop
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Marco
full_name: Valentini, Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
citation:
ama: 'Valentini M. Mesoscopic phenomena in hybrid semiconductor-superconductor nanodevices :
From full-shell nanowires to two-dimensional hole gas in germanium. 2023. doi:10.15479/at:ista:13286'
apa: 'Valentini, M. (2023). Mesoscopic phenomena in hybrid semiconductor-superconductor
nanodevices : From full-shell nanowires to two-dimensional hole gas in germanium.
Institute of Science and Technology Austria. https://doi.org/10.15479/at:ista:13286'
chicago: 'Valentini, Marco. “Mesoscopic Phenomena in Hybrid Semiconductor-Superconductor
Nanodevices : From Full-Shell Nanowires to Two-Dimensional Hole Gas in Germanium.”
Institute of Science and Technology Austria, 2023. https://doi.org/10.15479/at:ista:13286.'
ieee: 'M. Valentini, “Mesoscopic phenomena in hybrid semiconductor-superconductor
nanodevices : From full-shell nanowires to two-dimensional hole gas in germanium,”
Institute of Science and Technology Austria, 2023.'
ista: 'Valentini M. 2023. Mesoscopic phenomena in hybrid semiconductor-superconductor
nanodevices : From full-shell nanowires to two-dimensional hole gas in germanium.
Institute of Science and Technology Austria.'
mla: 'Valentini, Marco. Mesoscopic Phenomena in Hybrid Semiconductor-Superconductor
Nanodevices : From Full-Shell Nanowires to Two-Dimensional Hole Gas in Germanium.
Institute of Science and Technology Austria, 2023, doi:10.15479/at:ista:13286.'
short: 'M. Valentini, Mesoscopic Phenomena in Hybrid Semiconductor-Superconductor
Nanodevices : From Full-Shell Nanowires to Two-Dimensional Hole Gas in Germanium,
Institute of Science and Technology Austria, 2023.'
date_created: 2023-07-24T14:10:45Z
date_published: 2023-07-21T00:00:00Z
date_updated: 2024-02-21T12:35:34Z
day: '21'
ddc:
- '530'
degree_awarded: PhD
department:
- _id: GradSch
- _id: GeKa
doi: 10.15479/at:ista:13286
ec_funded: 1
file:
- access_level: closed
checksum: 666ee31c7eade89679806287c062fa14
content_type: application/x-zip-compressed
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date_created: 2023-08-11T09:27:39Z
date_updated: 2023-08-11T10:01:34Z
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creator: mvalenti
date_created: 2023-08-11T14:39:17Z
date_updated: 2023-08-11T14:39:17Z
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file_name: PhD_thesis_Valentini_final_validated.pdf
file_size: 38199711
relation: main_file
file_date_updated: 2023-08-11T14:39:17Z
has_accepted_license: '1'
language:
- iso: eng
month: '07'
oa: 1
oa_version: Published Version
page: '184'
project:
- _id: 262116AA-B435-11E9-9278-68D0E5697425
name: Hybrid Semiconductor - Superconductor Quantum Devices
- _id: 237E5020-32DE-11EA-91FC-C7463DDC885E
call_identifier: H2020
grant_number: '862046'
name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS
- _id: 34a66131-11ca-11ed-8bc3-a31681c6b03e
grant_number: F8606
name: Conventional and unconventional topological superconductors
publication_identifier:
issn:
- 2663 - 337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '13312'
relation: part_of_dissertation
status: public
- id: '12118'
relation: part_of_dissertation
status: public
- id: '8910'
relation: part_of_dissertation
status: public
- id: '12522'
relation: research_data
status: public
status: public
supervisor:
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
title: 'Mesoscopic phenomena in hybrid semiconductor-superconductor nanodevices :
From full-shell nanowires to two-dimensional hole gas in germanium'
tmp:
image: /images/cc_by_nc_sa.png
legal_code_url: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC
BY-NC-SA 4.0)
short: CC BY-NC-SA (4.0)
type: dissertation
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
year: '2023'
...
---
_id: '13312'
abstract:
- lang: eng
text: "Superconductor/semiconductor hybrid devices have attracted increasing\r\ninterest
in the past years. Superconducting electronics aims to complement\r\nsemiconductor
technology, while hybrid architectures are at the forefront of\r\nnew ideas such
as topological superconductivity and protected qubits. In this\r\nwork, we engineer
the induced superconductivity in two-dimensional germanium\r\nhole gas by varying
the distance between the quantum well and the aluminum. We\r\ndemonstrate a hard
superconducting gap and realize an electrically and flux\r\ntunable superconducting
diode using a superconducting quantum interference\r\ndevice (SQUID). This allows
to tune the current phase relation (CPR), to a\r\nregime where single Cooper pair
tunneling is suppressed, creating a $ \\sin\r\n\\left( 2 \\varphi \\right)$ CPR.
Shapiro experiments complement this\r\ninterpretation and the microwave drive
allows to create a diode with $ \\approx\r\n100 \\%$ efficiency. The reported
results open up the path towards monolithic\r\nintegration of spin qubit devices,
microwave resonators and (protected)\r\nsuperconducting qubits on a silicon technology
compatible platform."
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: "The authors acknowledge Alexander Brinkmann, Alessandro Crippa,
Andrew Higginbotham, Andrea Iorio, Giordano\r\nScappucci and Christian Schonenberger
for helpful discussions. We thank Marcel Verheijen for the support in the\r\nTEM
analysis. This research and related results were made\r\npossible with the support
of the NOMIS Foundation. It was\r\nsupported by the Scientific Service Units of
ISTA through resources provided by the MIBA Machine Shop and the\r\nnanofabrication
facility, the European Union’s Horizon 2020\r\nresearch and innovation programme
under Grant Agreement\r\nNo 862046, the HORIZON-RIA 101069515 project and the\r\nFWF
Projects #P-32235, #P-36507 and #F-8606. R.S.S.\r\nacknowledges Spanish CM “Talento
Program” Project No.\r\n2022-T1/IND-24070."
article_number: '2306.07109'
article_processing_charge: No
arxiv: 1
author:
- first_name: Marco
full_name: Valentini, Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
- first_name: Oliver
full_name: Sagi, Oliver
id: 71616374-A8E9-11E9-A7CA-09ECE5697425
last_name: Sagi
- first_name: Levon
full_name: Baghumyan, Levon
last_name: Baghumyan
- first_name: Thijs de
full_name: Gijsel, Thijs de
last_name: Gijsel
- first_name: Jason
full_name: Jung, Jason
id: 4C9ACE7A-F248-11E8-B48F-1D18A9856A87
last_name: Jung
- first_name: Stefano
full_name: Calcaterra, Stefano
last_name: Calcaterra
- first_name: Andrea
full_name: Ballabio, Andrea
last_name: Ballabio
- first_name: Juan Aguilera
full_name: Servin, Juan Aguilera
last_name: Servin
- first_name: Kushagra
full_name: Aggarwal, Kushagra
id: b22ab905-3539-11eb-84c3-fc159dcd79cb
last_name: Aggarwal
orcid: 0000-0001-9985-9293
- first_name: Marian
full_name: Janik, Marian
id: 396A1950-F248-11E8-B48F-1D18A9856A87
last_name: Janik
- first_name: Thomas
full_name: Adletzberger, Thomas
id: 38756BB2-F248-11E8-B48F-1D18A9856A87
last_name: Adletzberger
- first_name: Rubén Seoane
full_name: Souto, Rubén Seoane
last_name: Souto
- first_name: Martin
full_name: Leijnse, Martin
last_name: Leijnse
- first_name: Jeroen
full_name: Danon, Jeroen
last_name: Danon
- first_name: Constantin
full_name: Schrade, Constantin
last_name: Schrade
- first_name: Erik
full_name: Bakkers, Erik
last_name: Bakkers
- first_name: Daniel
full_name: Chrastina, Daniel
last_name: Chrastina
- first_name: Giovanni
full_name: Isella, Giovanni
last_name: Isella
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
citation:
ama: Valentini M, Sagi O, Baghumyan L, et al. Radio frequency driven superconducting
diode and parity conserving Cooper pair transport in a two-dimensional germanium
hole gas. arXiv. doi:10.48550/arXiv.2306.07109
apa: Valentini, M., Sagi, O., Baghumyan, L., Gijsel, T. de, Jung, J., Calcaterra,
S., … Katsaros, G. (n.d.). Radio frequency driven superconducting diode and parity
conserving Cooper pair transport in a two-dimensional germanium hole gas. arXiv.
https://doi.org/10.48550/arXiv.2306.07109
chicago: Valentini, Marco, Oliver Sagi, Levon Baghumyan, Thijs de Gijsel, Jason
Jung, Stefano Calcaterra, Andrea Ballabio, et al. “Radio Frequency Driven Superconducting
Diode and Parity Conserving Cooper Pair Transport in a Two-Dimensional Germanium
Hole Gas.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2306.07109.
ieee: M. Valentini et al., “Radio frequency driven superconducting diode
and parity conserving Cooper pair transport in a two-dimensional germanium hole
gas,” arXiv. .
ista: Valentini M, Sagi O, Baghumyan L, Gijsel T de, Jung J, Calcaterra S, Ballabio
A, Servin JA, Aggarwal K, Janik M, Adletzberger T, Souto RS, Leijnse M, Danon
J, Schrade C, Bakkers E, Chrastina D, Isella G, Katsaros G. Radio frequency driven
superconducting diode and parity conserving Cooper pair transport in a two-dimensional
germanium hole gas. arXiv, 2306.07109.
mla: Valentini, Marco, et al. “Radio Frequency Driven Superconducting Diode and
Parity Conserving Cooper Pair Transport in a Two-Dimensional Germanium Hole Gas.”
ArXiv, 2306.07109, doi:10.48550/arXiv.2306.07109.
short: M. Valentini, O. Sagi, L. Baghumyan, T. de Gijsel, J. Jung, S. Calcaterra,
A. Ballabio, J.A. Servin, K. Aggarwal, M. Janik, T. Adletzberger, R.S. Souto,
M. Leijnse, J. Danon, C. Schrade, E. Bakkers, D. Chrastina, G. Isella, G. Katsaros,
ArXiv (n.d.).
date_created: 2023-07-26T11:17:20Z
date_published: 2023-06-13T00:00:00Z
date_updated: 2024-02-07T07:52:32Z
day: '13'
ddc:
- '530'
department:
- _id: GeKa
- _id: M-Shop
doi: 10.48550/arXiv.2306.07109
ec_funded: 1
external_id:
arxiv:
- '2306.07109'
keyword:
- Mesoscale and Nanoscale Physics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2306.07109
month: '06'
oa: 1
oa_version: Preprint
project:
- _id: 237E5020-32DE-11EA-91FC-C7463DDC885E
call_identifier: H2020
grant_number: '862046'
name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS
- _id: 237B3DA4-32DE-11EA-91FC-C7463DDC885E
call_identifier: FWF
grant_number: P32235
name: Towards scalable hut wire quantum devices
- _id: bd8bd29e-d553-11ed-ba76-f0070d4b237a
grant_number: P36507
name: Merging spin and superconducting qubits in planar Ge
- _id: 34a66131-11ca-11ed-8bc3-a31681c6b03e
grant_number: F8606
name: Conventional and unconventional topological superconductors
- _id: bd5b4ec5-d553-11ed-ba76-a6eedb083344
name: Protected states of quantum matter
publication: arXiv
publication_status: submitted
related_material:
record:
- id: '13286'
relation: dissertation_contains
status: public
status: public
title: Radio frequency driven superconducting diode and parity conserving Cooper
pair transport in a two-dimensional germanium hole gas
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: preprint
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
year: '2023'
...
---
_id: '10920'
abstract:
- lang: eng
text: The spin-orbit interaction permits to control the state of a spin qubit via
electric fields. For holes it is particularly strong, allowing for fast all electrical
qubit manipulation, and yet an in-depth understanding of this interaction in hole
systems is missing. Here we investigate, experimentally and theoretically, the
effect of the cubic Rashba spin-orbit interaction on the mixing of the spin states
by studying singlet-triplet oscillations in a planar Ge hole double quantum dot.
Landau-Zener sweeps at different magnetic field directions allow us to disentangle
the effects of the spin-orbit induced spin-flip term from those caused by strongly
site-dependent and anisotropic quantum dot g tensors. Our work, therefore, provides
new insights into the hole spin-orbit interaction, necessary for optimizing future
qubit experiments.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: "This research was supported by the Scientific Service Units of ISTA
through resources provided by the MIBA Machine Shop and the nanofabrication facility.
This project has received funding from the European Union’s Horizon 2020 research
and innovation program under the Marie\r\nSkłodowska-Curie Grant Agreement No. 844511,
No. 75441, and by the FWF-P 30207, I05060, and M3032-N projects. A. B. acknowledges
support from the EU Horizon-2020 FET project microSPIRE, ID: 766955. P.M. M. and
G. B. acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG—German Research
Foundation) under Project No. 450396347. This work was supported by the Royal Society
(URF\\R1\\191150) and the European Research Council (Grant Agreement No. 948932),
N. A. acknowledges the use of the University of Oxford Advanced Research Computing
(ARC) facility."
article_number: '126803'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Daniel
full_name: Jirovec, Daniel
id: 4C473F58-F248-11E8-B48F-1D18A9856A87
last_name: Jirovec
orcid: 0000-0002-7197-4801
- first_name: Philipp M.
full_name: Mutter, Philipp M.
last_name: Mutter
- first_name: Andrea C
full_name: Hofmann, Andrea C
id: 340F461A-F248-11E8-B48F-1D18A9856A87
last_name: Hofmann
- first_name: Alessandro
full_name: Crippa, Alessandro
id: 1F2B21A2-F6E7-11E9-9B82-F7DBE5697425
last_name: Crippa
orcid: 0000-0002-2968-611X
- first_name: Marek
full_name: Rychetsky, Marek
last_name: Rychetsky
- first_name: David L.
full_name: Craig, David L.
last_name: Craig
- first_name: Josip
full_name: Kukucka, Josip
id: 3F5D8856-F248-11E8-B48F-1D18A9856A87
last_name: Kukucka
- first_name: Frederico
full_name: Martins, Frederico
id: 38F80F9A-1CB8-11EA-BC76-B49B3DDC885E
last_name: Martins
orcid: 0000-0003-2668-2401
- first_name: Andrea
full_name: Ballabio, Andrea
last_name: Ballabio
- first_name: Natalia
full_name: Ares, Natalia
last_name: Ares
- first_name: Daniel
full_name: Chrastina, Daniel
last_name: Chrastina
- first_name: Giovanni
full_name: Isella, Giovanni
last_name: Isella
- first_name: 'Guido '
full_name: 'Burkard, Guido '
last_name: Burkard
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
citation:
ama: Jirovec D, Mutter PM, Hofmann AC, et al. Dynamics of hole singlet-triplet qubits
with large g-factor differences. Physical Review Letters. 2022;128(12).
doi:10.1103/PhysRevLett.128.126803
apa: Jirovec, D., Mutter, P. M., Hofmann, A. C., Crippa, A., Rychetsky, M., Craig,
D. L., … Katsaros, G. (2022). Dynamics of hole singlet-triplet qubits with large
g-factor differences. Physical Review Letters. American Physical Society.
https://doi.org/10.1103/PhysRevLett.128.126803
chicago: Jirovec, Daniel, Philipp M. Mutter, Andrea C Hofmann, Alessandro Crippa,
Marek Rychetsky, David L. Craig, Josip Kukucka, et al. “Dynamics of Hole Singlet-Triplet
Qubits with Large g-Factor Differences.” Physical Review Letters. American
Physical Society, 2022. https://doi.org/10.1103/PhysRevLett.128.126803.
ieee: D. Jirovec et al., “Dynamics of hole singlet-triplet qubits with large
g-factor differences,” Physical Review Letters, vol. 128, no. 12. American
Physical Society, 2022.
ista: Jirovec D, Mutter PM, Hofmann AC, Crippa A, Rychetsky M, Craig DL, Kukucka
J, Martins F, Ballabio A, Ares N, Chrastina D, Isella G, Burkard G, Katsaros G.
2022. Dynamics of hole singlet-triplet qubits with large g-factor differences.
Physical Review Letters. 128(12), 126803.
mla: Jirovec, Daniel, et al. “Dynamics of Hole Singlet-Triplet Qubits with Large
g-Factor Differences.” Physical Review Letters, vol. 128, no. 12, 126803,
American Physical Society, 2022, doi:10.1103/PhysRevLett.128.126803.
short: D. Jirovec, P.M. Mutter, A.C. Hofmann, A. Crippa, M. Rychetsky, D.L. Craig,
J. Kukucka, F. Martins, A. Ballabio, N. Ares, D. Chrastina, G. Isella, G. Burkard,
G. Katsaros, Physical Review Letters 128 (2022).
date_created: 2022-03-24T15:51:11Z
date_published: 2022-03-24T00:00:00Z
date_updated: 2023-08-03T06:14:58Z
day: '24'
ddc:
- '530'
department:
- _id: GradSch
- _id: GeKa
doi: 10.1103/PhysRevLett.128.126803
ec_funded: 1
external_id:
arxiv:
- '2111.05130'
isi:
- '000786542500004'
file:
- access_level: open_access
checksum: 6e66ad548d18db9c131f304acbd5a1f4
content_type: application/pdf
creator: dernst
date_created: 2022-03-28T06:53:39Z
date_updated: 2022-03-28T06:53:39Z
file_id: '10928'
file_name: 2022_PhysRevLetters_Jirovec.pdf
file_size: 1266515
relation: main_file
success: 1
file_date_updated: 2022-03-28T06:53:39Z
has_accepted_license: '1'
intvolume: ' 128'
isi: 1
issue: '12'
language:
- iso: eng
month: '03'
oa: 1
oa_version: Published Version
project:
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '844511'
name: Majorana bound states in Ge/SiGe heterostructures
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
- _id: 2641CE5E-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P30207
name: Hole spin orbit qubits in Ge quantum wells
- _id: c0977eea-5a5b-11eb-8a69-a862db0cf4d1
grant_number: I05060
name: High impedance circuit quantum electrodynamics with hole spins
- _id: c08c05c4-5a5b-11eb-8a69-dc6ce49d7973
grant_number: M03032
name: Long-range spin exchange for 2D qubits architectures
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
status: public
title: Dynamics of hole singlet-triplet qubits with large g-factor differences
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 128
year: '2022'
...
---
_id: '12118'
abstract:
- lang: eng
text: Hybrid semiconductor–superconductor devices hold great promise for realizing
topological quantum computing with Majorana zero modes1,2,3,4,5. However, multiple
claims of Majorana detection, based on either tunnelling6,7,8,9,10 or Coulomb
blockade (CB) spectroscopy11,12, remain disputed. Here we devise an experimental
protocol that allows us to perform both types of measurement on the same hybrid
island by adjusting its charging energy via tunable junctions to the normal leads.
This method reduces ambiguities of Majorana detections by checking the consistency
between CB spectroscopy and zero-bias peaks in non-blockaded transport. Specifically,
we observe junction-dependent, even–odd modulated, single-electron CB peaks in
InAs/Al hybrid nanowires without concomitant low-bias peaks in tunnelling spectroscopy.
We provide a theoretical interpretation of the experimental observations in terms
of low-energy, longitudinally confined island states rather than overlapping Majorana
modes. Our results highlight the importance of combined measurements on the same
device for the identification of topological Majorana zero modes.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: We thank P. Krogstrup for providing us with the NW materials. We
thank A. Higginbotham, E. J. H. Lee, C. Marcus and S. Vaitiekėnas for helpful discussions
and G. Steffensen for his input on the diffusive Little-Parks theory. This research
was supported by the Scientific Service Units of ISTA through resources provided
by the MIBA Machine Shop and the nanofabrication facility; the NOMIS Foundation;
the CSIC Interdisciplinary Thematic Platform (PTI+) on Quantum Technologies (PTI-QTEP+).
A.H. acknowledges support from H2020-MSCA-IF-2018/844511. ICN2 also acknowledges
funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported by the Severo
Ochoa Program from Spanish MINECO (Grant no. SEV-2017-0706) and is funded by the
CERCA Programme/Generalitat de Catalunya. Part of the present work has been performed
in the framework of Universitat Autònoma de Barcelona Materials Science PhD programme.
Authors acknowledge the use of instrumentation as well as the technical advice provided
by the National Facility ELECMI ICTS, node ‘Laboratorio de Microscopías Avanzadas’
at University of Zaragoza. This project has received funding from the European Union’s
Horizon 2020 research and innovation programme under grant agreement no. 823717-ESTEEM3.
This study was supported by MCIN with funding from European Union NextGenerationEU
(PRTR-C17.I1) and Generalitat de Catalunya. This research is part of the CSIC programme
for the Spanish Recovery, Transformation and Resilience Plan funded by the Recovery
and Resilience Facility of the European Union, established by the Regulation (EU)
2020/2094. We thank support from Grant PGC2018-097018-BI00, project FlagERA TOPOGRAPH
(PCI2018-093026) and project NANOGEN (PID2020-116093RB-C43), funded by MCIN/AEI/10.13039/501100011033/
and by ‘ERDF A way of making Europe’, by the European Union. M. Botifoll acknowledges
support from SUR Generalitat de Catalunya and the EU Social Fund (project ref. 2020
FI 00103).
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Marco
full_name: Valentini, Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
- first_name: Maksim
full_name: Borovkov, Maksim
id: 2ac7a0a2-3562-11eb-9256-fbd18ea55087
last_name: Borovkov
- first_name: Elsa
full_name: Prada, Elsa
last_name: Prada
- first_name: Sara
full_name: Martí-Sánchez, Sara
last_name: Martí-Sánchez
- first_name: Marc
full_name: Botifoll, Marc
last_name: Botifoll
- first_name: Andrea C
full_name: Hofmann, Andrea C
id: 340F461A-F248-11E8-B48F-1D18A9856A87
last_name: Hofmann
- first_name: Jordi
full_name: Arbiol, Jordi
last_name: Arbiol
- first_name: Ramón
full_name: Aguado, Ramón
last_name: Aguado
- first_name: Pablo
full_name: San-Jose, Pablo
last_name: San-Jose
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
citation:
ama: Valentini M, Borovkov M, Prada E, et al. Majorana-like Coulomb spectroscopy
in the absence of zero-bias peaks. Nature. 2022;612(7940):442-447. doi:10.1038/s41586-022-05382-w
apa: Valentini, M., Borovkov, M., Prada, E., Martí-Sánchez, S., Botifoll, M., Hofmann,
A. C., … Katsaros, G. (2022). Majorana-like Coulomb spectroscopy in the absence
of zero-bias peaks. Nature. Springer Nature. https://doi.org/10.1038/s41586-022-05382-w
chicago: Valentini, Marco, Maksim Borovkov, Elsa Prada, Sara Martí-Sánchez, Marc
Botifoll, Andrea C Hofmann, Jordi Arbiol, Ramón Aguado, Pablo San-Jose, and Georgios
Katsaros. “Majorana-like Coulomb Spectroscopy in the Absence of Zero-Bias Peaks.”
Nature. Springer Nature, 2022. https://doi.org/10.1038/s41586-022-05382-w.
ieee: M. Valentini et al., “Majorana-like Coulomb spectroscopy in the absence
of zero-bias peaks,” Nature, vol. 612, no. 7940. Springer Nature, pp. 442–447,
2022.
ista: Valentini M, Borovkov M, Prada E, Martí-Sánchez S, Botifoll M, Hofmann AC,
Arbiol J, Aguado R, San-Jose P, Katsaros G. 2022. Majorana-like Coulomb spectroscopy
in the absence of zero-bias peaks. Nature. 612(7940), 442–447.
mla: Valentini, Marco, et al. “Majorana-like Coulomb Spectroscopy in the Absence
of Zero-Bias Peaks.” Nature, vol. 612, no. 7940, Springer Nature, 2022,
pp. 442–47, doi:10.1038/s41586-022-05382-w.
short: M. Valentini, M. Borovkov, E. Prada, S. Martí-Sánchez, M. Botifoll, A.C.
Hofmann, J. Arbiol, R. Aguado, P. San-Jose, G. Katsaros, Nature 612 (2022) 442–447.
date_created: 2023-01-12T11:56:45Z
date_published: 2022-12-15T00:00:00Z
date_updated: 2024-02-21T12:35:33Z
day: '15'
department:
- _id: GeKa
doi: 10.1038/s41586-022-05382-w
ec_funded: 1
external_id:
arxiv:
- '2203.07829'
isi:
- '000899725400001'
intvolume: ' 612'
isi: 1
issue: '7940'
keyword:
- Multidisciplinary
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.2203.07829'
month: '12'
oa: 1
oa_version: Preprint
page: 442-447
project:
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '844511'
name: Majorana bound states in Ge/SiGe heterostructures
publication: Nature
publication_identifier:
eissn:
- 1476-4687
issn:
- 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
link:
- description: News on ISTA Website
relation: press_release
url: https://ista.ac.at/en/news/imposter-particles-revealed-and-explained/
record:
- id: '13286'
relation: dissertation_contains
status: public
- id: '12522'
relation: research_data
status: public
scopus_import: '1'
status: public
title: Majorana-like Coulomb spectroscopy in the absence of zero-bias peaks
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 612
year: '2022'
...
---
_id: '12522'
abstract:
- lang: eng
text: This .zip File contains the transport data, the codes for the data analysis,
the microscopy analysis and the codes for the theoretical simulations for "Majorana-like
Coulomb spectroscopy in the absence of zero bias peaks" by M. Valentini, et. al.
The transport data are saved with hdf5 file format. The files can be open with
the log browser of Labber.
article_processing_charge: No
author:
- first_name: Marco
full_name: Valentini, Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
- first_name: Pablo
full_name: San-Jose, Pablo
last_name: San-Jose
- first_name: Jordi
full_name: Arbiol, Jordi
last_name: Arbiol
- first_name: Sara
full_name: Marti-Sanchez, Sara
last_name: Marti-Sanchez
- first_name: Marc
full_name: Botifoll, Marc
last_name: Botifoll
citation:
ama: Valentini M, San-Jose P, Arbiol J, Marti-Sanchez S, Botifoll M. Data for “Majorana-like
Coulomb spectroscopy in the absence of zero bias peaks.” 2022. doi:10.15479/AT:ISTA:12102
apa: Valentini, M., San-Jose, P., Arbiol, J., Marti-Sanchez, S., & Botifoll,
M. (2022). Data for “Majorana-like Coulomb spectroscopy in the absence of zero
bias peaks.” Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:12102
chicago: Valentini, Marco, Pablo San-Jose, Jordi Arbiol, Sara Marti-Sanchez, and
Marc Botifoll. “Data for ‘Majorana-like Coulomb Spectroscopy in the Absence of
Zero Bias Peaks.’” Institute of Science and Technology Austria, 2022. https://doi.org/10.15479/AT:ISTA:12102.
ieee: M. Valentini, P. San-Jose, J. Arbiol, S. Marti-Sanchez, and M. Botifoll, “Data
for ‘Majorana-like Coulomb spectroscopy in the absence of zero bias peaks.’” Institute
of Science and Technology Austria, 2022.
ista: Valentini M, San-Jose P, Arbiol J, Marti-Sanchez S, Botifoll M. 2022. Data
for ‘Majorana-like Coulomb spectroscopy in the absence of zero bias peaks’, Institute
of Science and Technology Austria, 10.15479/AT:ISTA:12102.
mla: Valentini, Marco, et al. Data for “Majorana-like Coulomb Spectroscopy in
the Absence of Zero Bias Peaks.” Institute of Science and Technology Austria,
2022, doi:10.15479/AT:ISTA:12102.
short: M. Valentini, P. San-Jose, J. Arbiol, S. Marti-Sanchez, M. Botifoll, (2022).
contributor:
- contributor_type: contact_person
first_name: Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
date_created: 2023-02-07T08:13:39Z
date_published: 2022-09-25T00:00:00Z
date_updated: 2024-02-21T12:35:34Z
day: '25'
ddc:
- '530'
department:
- _id: GeKa
doi: 10.15479/AT:ISTA:12102
file:
- access_level: open_access
checksum: 0dbd6327bf84c7e81b295c4bc9d12826
content_type: application/x-zip-compressed
creator: dernst
date_created: 2023-02-07T08:18:24Z
date_updated: 2023-02-07T08:18:24Z
file_id: '12523'
file_name: Majorana_like.zip
file_size: 3609122411
relation: main_file
success: 1
file_date_updated: 2023-02-07T08:18:24Z
has_accepted_license: '1'
month: '09'
oa: 1
oa_version: Published Version
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '12118'
relation: used_in_publication
status: public
- id: '13286'
relation: used_in_publication
status: public
status: public
title: Data for "Majorana-like Coulomb spectroscopy in the absence of zero bias peaks"
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: research_data
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2022'
...
---
_id: '8909'
abstract:
- lang: eng
text: Spin qubits are considered to be among the most promising candidates for building
a quantum processor. Group IV hole spin qubits have moved into the focus of interest
due to the ease of operation and compatibility with Si technology. In addition,
Ge offers the option for monolithic superconductor-semiconductor integration.
Here we demonstrate a hole spin qubit operating at fields below 10 mT, the critical
field of Al, by exploiting the large out-of-plane hole g-factors in planar Ge
and by encoding the qubit into the singlet-triplet states of a double quantum
dot. We observe electrically controlled X and Z-rotations with tunable frequencies
exceeding 100 MHz and dephasing times of 1μs which we extend beyond 15μs with
echo techniques. These results show that Ge hole singlet triplet qubits outperform
their electronic Si and GaAs based counterparts in speed and coherence, respectively.
In addition, they are on par with Ge single spin qubits, but can be operated at
much lower fields underlining their potential for on chip integration with superconducting
technologies.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: This research was supported by the Scientific Service Units of Institute
of Science and Technology (IST) Austria through resources provided by the Miba Machine
Shop and the nanofabrication facility, and was made possible with the support of
the NOMIS Foundation. This project has received funding from the European Union’s
Horizon 2020 research and innovation programme under Marie Sklodowska-Curie grant
agreements no. 844511 and no. 75441, and by the Austrian Science Fund FWF-P 30207
project. A.B. acknowledges support from the European Union Horizon 2020 FET project
microSPIRE, no. 766955. M. Botifoll and J.A. acknowledge funding from Generalitat
de Catalunya 2017 SGR 327. The Catalan Institute of Nanoscience and Nanotechnology
(ICN2) is supported by the Severo Ochoa programme from the Spanish Ministery of
Economy (MINECO) (grant no. SEV-2017-0706) and is funded by the Catalonian Research
Centre (CERCA) Programme, Generalitat de Catalunya. Part of the present work has
been performed within the framework of the Universitat Autónoma de Barcelona Materials
Science PhD programme. Part of the HAADF scanning transmission electron microscopy
was conducted in the Laboratorio de Microscopias Avanzadas at Instituto de Nanociencia
de Aragon, Universidad de Zaragoza. ICN2 acknowledge support from the Spanish Superior
Council of Scientific Research (CSIC) Research Platform on Quantum Technologies
PTI-001. M.B. acknowledges funding from the Catalan Agency for Management of University
and Research Grants (AGAUR) Generalitat de Catalunya formation of investigators
(FI) PhD grant.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Daniel
full_name: Jirovec, Daniel
id: 4C473F58-F248-11E8-B48F-1D18A9856A87
last_name: Jirovec
orcid: 0000-0002-7197-4801
- first_name: Andrea C
full_name: Hofmann, Andrea C
id: 340F461A-F248-11E8-B48F-1D18A9856A87
last_name: Hofmann
- first_name: Andrea
full_name: Ballabio, Andrea
last_name: Ballabio
- first_name: Philipp M.
full_name: Mutter, Philipp M.
last_name: Mutter
- first_name: Giulio
full_name: Tavani, Giulio
last_name: Tavani
- first_name: Marc
full_name: Botifoll, Marc
last_name: Botifoll
- first_name: Alessandro
full_name: Crippa, Alessandro
id: 1F2B21A2-F6E7-11E9-9B82-F7DBE5697425
last_name: Crippa
orcid: 0000-0002-2968-611X
- first_name: Josip
full_name: Kukucka, Josip
id: 3F5D8856-F248-11E8-B48F-1D18A9856A87
last_name: Kukucka
- first_name: Oliver
full_name: Sagi, Oliver
id: 71616374-A8E9-11E9-A7CA-09ECE5697425
last_name: Sagi
- first_name: Frederico
full_name: Martins, Frederico
id: 38F80F9A-1CB8-11EA-BC76-B49B3DDC885E
last_name: Martins
orcid: 0000-0003-2668-2401
- first_name: Jaime
full_name: Saez Mollejo, Jaime
id: e0390f72-f6e0-11ea-865d-862393336714
last_name: Saez Mollejo
- first_name: Ivan
full_name: Prieto Gonzalez, Ivan
id: 2A307FE2-F248-11E8-B48F-1D18A9856A87
last_name: Prieto Gonzalez
orcid: 0000-0002-7370-5357
- first_name: Maksim
full_name: Borovkov, Maksim
id: 2ac7a0a2-3562-11eb-9256-fbd18ea55087
last_name: Borovkov
- first_name: Jordi
full_name: Arbiol, Jordi
last_name: Arbiol
- first_name: Daniel
full_name: Chrastina, Daniel
last_name: Chrastina
- first_name: Giovanni
full_name: Isella, Giovanni
last_name: Isella
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
citation:
ama: Jirovec D, Hofmann AC, Ballabio A, et al. A singlet triplet hole spin qubit
in planar Ge. Nature Materials. 2021;20(8):1106–1112. doi:10.1038/s41563-021-01022-2
apa: Jirovec, D., Hofmann, A. C., Ballabio, A., Mutter, P. M., Tavani, G., Botifoll,
M., … Katsaros, G. (2021). A singlet triplet hole spin qubit in planar Ge. Nature
Materials. Springer Nature. https://doi.org/10.1038/s41563-021-01022-2
chicago: Jirovec, Daniel, Andrea C Hofmann, Andrea Ballabio, Philipp M. Mutter,
Giulio Tavani, Marc Botifoll, Alessandro Crippa, et al. “A Singlet Triplet Hole
Spin Qubit in Planar Ge.” Nature Materials. Springer Nature, 2021. https://doi.org/10.1038/s41563-021-01022-2.
ieee: D. Jirovec et al., “A singlet triplet hole spin qubit in planar Ge,”
Nature Materials, vol. 20, no. 8. Springer Nature, pp. 1106–1112, 2021.
ista: Jirovec D, Hofmann AC, Ballabio A, Mutter PM, Tavani G, Botifoll M, Crippa
A, Kukucka J, Sagi O, Martins F, Saez Mollejo J, Prieto Gonzalez I, Borovkov M,
Arbiol J, Chrastina D, Isella G, Katsaros G. 2021. A singlet triplet hole spin
qubit in planar Ge. Nature Materials. 20(8), 1106–1112.
mla: Jirovec, Daniel, et al. “A Singlet Triplet Hole Spin Qubit in Planar Ge.” Nature
Materials, vol. 20, no. 8, Springer Nature, 2021, pp. 1106–1112, doi:10.1038/s41563-021-01022-2.
short: D. Jirovec, A.C. Hofmann, A. Ballabio, P.M. Mutter, G. Tavani, M. Botifoll,
A. Crippa, J. Kukucka, O. Sagi, F. Martins, J. Saez Mollejo, I. Prieto Gonzalez,
M. Borovkov, J. Arbiol, D. Chrastina, G. Isella, G. Katsaros, Nature Materials
20 (2021) 1106–1112.
date_created: 2020-12-02T10:50:47Z
date_published: 2021-08-01T00:00:00Z
date_updated: 2024-03-25T23:30:14Z
day: '01'
department:
- _id: GeKa
- _id: NanoFab
- _id: GradSch
doi: 10.1038/s41563-021-01022-2
ec_funded: 1
external_id:
arxiv:
- '2011.13755'
isi:
- '000657596400001'
intvolume: ' 20'
isi: 1
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2011.13755
month: '08'
oa: 1
oa_version: Preprint
page: 1106–1112
project:
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '844511'
name: Majorana bound states in Ge/SiGe heterostructures
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
- _id: 2641CE5E-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P30207
name: Hole spin orbit qubits in Ge quantum wells
- _id: 262116AA-B435-11E9-9278-68D0E5697425
name: Hybrid Semiconductor - Superconductor Quantum Devices
publication: Nature Materials
publication_identifier:
eissn:
- 1476-4660
issn:
- 1476-1122
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
link:
- description: News on IST Homepage
relation: press_release
url: https://ist.ac.at/en/news/quantum-computing-with-holes/
record:
- id: '9323'
relation: research_data
status: public
- id: '10058'
relation: dissertation_contains
status: public
scopus_import: '1'
status: public
title: A singlet triplet hole spin qubit in planar Ge
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 20
year: '2021'
...
---
_id: '8910'
abstract:
- lang: eng
text: A semiconducting nanowire fully wrapped by a superconducting shell has been
proposed as a platform for obtaining Majorana modes at small magnetic fields.
In this study, we demonstrate that the appearance of subgap states in such structures
is actually governed by the junction region in tunneling spectroscopy measurements
and not the full-shell nanowire itself. Short tunneling regions never show subgap
states, whereas longer junctions always do. This can be understood in terms of
quantum dots forming in the junction and hosting Andreev levels in the Yu-Shiba-Rusinov
regime. The intricate magnetic field dependence of the Andreev levels, through
both the Zeeman and Little-Parks effects, may result in robust zero-bias peaks—features
that could be easily misinterpreted as originating from Majorana zero modes but
are unrelated to topological superconductivity.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: The authors thank A. Higginbotham, E. J. H. Lee and F. R. Martins
for helpful discussions. This research was supported by the Scientific Service Units
of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication
facility; the NOMIS Foundation and Microsoft; the European Union’s Horizon 2020
research and innovation program under the Marie SklodowskaCurie grant agreement
No 844511; the FETOPEN Grant Agreement No. 828948; the European Research Commission
through the grant agreement HEMs-DAM No 716655; the Spanish Ministry of Science
and Innovation through Grants PGC2018-097018-B-I00, PCI2018-093026, FIS2016-80434-P
(AEI/FEDER, EU), RYC2011-09345 (Ram´on y Cajal Programme), and the Mar´ıa de Maeztu
Programme for Units of Excellence in R&D (CEX2018-000805-M); the CSIC Research Platform
on Quantum Technologies PTI-001.
article_number: 82-88
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Marco
full_name: Valentini, Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
- first_name: Fernando
full_name: Peñaranda, Fernando
last_name: Peñaranda
- first_name: Andrea C
full_name: Hofmann, Andrea C
id: 340F461A-F248-11E8-B48F-1D18A9856A87
last_name: Hofmann
- first_name: Matthias
full_name: Brauns, Matthias
id: 33F94E3C-F248-11E8-B48F-1D18A9856A87
last_name: Brauns
- first_name: Robert
full_name: Hauschild, Robert
id: 4E01D6B4-F248-11E8-B48F-1D18A9856A87
last_name: Hauschild
orcid: 0000-0001-9843-3522
- first_name: Peter
full_name: Krogstrup, Peter
last_name: Krogstrup
- first_name: Pablo
full_name: San-Jose, Pablo
last_name: San-Jose
- first_name: Elsa
full_name: Prada, Elsa
last_name: Prada
- first_name: Ramón
full_name: Aguado, Ramón
last_name: Aguado
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
citation:
ama: Valentini M, Peñaranda F, Hofmann AC, et al. Nontopological zero-bias peaks
in full-shell nanowires induced by flux-tunable Andreev states. Science.
2021;373(6550). doi:10.1126/science.abf1513
apa: Valentini, M., Peñaranda, F., Hofmann, A. C., Brauns, M., Hauschild, R., Krogstrup,
P., … Katsaros, G. (2021). Nontopological zero-bias peaks in full-shell nanowires
induced by flux-tunable Andreev states. Science. American Association for
the Advancement of Science. https://doi.org/10.1126/science.abf1513
chicago: Valentini, Marco, Fernando Peñaranda, Andrea C Hofmann, Matthias Brauns,
Robert Hauschild, Peter Krogstrup, Pablo San-Jose, Elsa Prada, Ramón Aguado, and
Georgios Katsaros. “Nontopological Zero-Bias Peaks in Full-Shell Nanowires Induced
by Flux-Tunable Andreev States.” Science. American Association for the
Advancement of Science, 2021. https://doi.org/10.1126/science.abf1513.
ieee: M. Valentini et al., “Nontopological zero-bias peaks in full-shell
nanowires induced by flux-tunable Andreev states,” Science, vol. 373, no.
6550. American Association for the Advancement of Science, 2021.
ista: Valentini M, Peñaranda F, Hofmann AC, Brauns M, Hauschild R, Krogstrup P,
San-Jose P, Prada E, Aguado R, Katsaros G. 2021. Nontopological zero-bias peaks
in full-shell nanowires induced by flux-tunable Andreev states. Science. 373(6550),
82–88.
mla: Valentini, Marco, et al. “Nontopological Zero-Bias Peaks in Full-Shell Nanowires
Induced by Flux-Tunable Andreev States.” Science, vol. 373, no. 6550, 82–88,
American Association for the Advancement of Science, 2021, doi:10.1126/science.abf1513.
short: M. Valentini, F. Peñaranda, A.C. Hofmann, M. Brauns, R. Hauschild, P. Krogstrup,
P. San-Jose, E. Prada, R. Aguado, G. Katsaros, Science 373 (2021).
date_created: 2020-12-02T10:51:52Z
date_published: 2021-07-02T00:00:00Z
date_updated: 2024-02-21T12:40:09Z
day: '02'
department:
- _id: GeKa
- _id: Bio
doi: 10.1126/science.abf1513
ec_funded: 1
external_id:
arxiv:
- '2008.02348'
isi:
- '000677843100034'
intvolume: ' 373'
isi: 1
issue: '6550'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2008.02348
month: '07'
oa: 1
oa_version: Submitted Version
project:
- _id: 262116AA-B435-11E9-9278-68D0E5697425
name: Hybrid Semiconductor - Superconductor Quantum Devices
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '844511'
name: Majorana bound states in Ge/SiGe heterostructures
publication: Science
publication_identifier:
eissn:
- '10959203'
issn:
- '00368075'
publication_status: published
publisher: American Association for the Advancement of Science
quality_controlled: '1'
related_material:
link:
- description: News on IST Homepage
relation: press_release
url: https://ist.ac.at/en/news/unfinding-a-split-electron/
record:
- id: '13286'
relation: dissertation_contains
status: public
- id: '9389'
relation: research_data
status: public
scopus_import: '1'
status: public
title: Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable
Andreev states
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 373
year: '2021'
...
---
_id: '8911'
abstract:
- lang: eng
text: "In the worldwide endeavor for disruptive quantum technologies, germanium
is emerging as a versatile material to realize devices capable of encoding, processing,
or transmitting quantum information. These devices leverage special properties
of the germanium valence-band states, commonly known as holes, such as their inherently
strong spin-orbit coupling and the ability to host superconducting pairing correlations.
In this Review, we initially introduce the physics of holes in low-dimensional
germanium structures with key insights from a theoretical perspective. We then
examine the material science progress underpinning germanium-based planar heterostructures
and nanowires. We review the most significant experimental results demonstrating
key building blocks for quantum technology, such as an electrically driven universal
quantum gate set with spin qubits in quantum dots and superconductor-semiconductor
devices for hybrid quantum systems. We conclude by identifying the most promising
prospects\r\ntoward scalable quantum information processing. "
acknowledgement: "G.S., M.W.,F.A.Z acknowledge financial support from The Netherlands
Organization for Scientific Research (NWO). F.Z., D.L., G.K. acknowledge funding
from the European Union’s Horizon 2020 research and innovation programme under Grand
Agreement Nr. 862046. G.K. acknowledges funding from FP7 ERC Starting Grant 335497,
FWF Y 715-N30, FWF P-30207. S.D. acknowledges support from the European Union’s
Horizon 2020 program under Grant\r\nAgreement No. 81050 and from the Agence Nationale
de la Recherche through the TOPONANO and CMOSQSPIN projects. J.Z. acknowledges support
from the National Key R&D Program of China (Grant No. 2016YFA0301701) and Strategic
Priority Research Program of CAS (Grant No. XDB30000000). D.L. and C.K. acknowledge
the Swiss National Science Foundation and NCCR QSIT."
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Giordano
full_name: Scappucci, Giordano
last_name: Scappucci
- first_name: Christoph
full_name: Kloeffel, Christoph
last_name: Kloeffel
- first_name: Floris A.
full_name: Zwanenburg, Floris A.
last_name: Zwanenburg
- first_name: Daniel
full_name: Loss, Daniel
last_name: Loss
- first_name: Maksym
full_name: Myronov, Maksym
last_name: Myronov
- first_name: Jian-Jun
full_name: Zhang, Jian-Jun
last_name: Zhang
- first_name: Silvano De
full_name: Franceschi, Silvano De
last_name: Franceschi
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
- first_name: Menno
full_name: Veldhorst, Menno
last_name: Veldhorst
citation:
ama: Scappucci G, Kloeffel C, Zwanenburg FA, et al. The germanium quantum information
route. Nature Reviews Materials. 2021;6:926–943. doi:10.1038/s41578-020-00262-z
apa: Scappucci, G., Kloeffel, C., Zwanenburg, F. A., Loss, D., Myronov, M., Zhang,
J.-J., … Veldhorst, M. (2021). The germanium quantum information route. Nature
Reviews Materials. Springer Nature. https://doi.org/10.1038/s41578-020-00262-z
chicago: Scappucci, Giordano, Christoph Kloeffel, Floris A. Zwanenburg, Daniel Loss,
Maksym Myronov, Jian-Jun Zhang, Silvano De Franceschi, Georgios Katsaros, and
Menno Veldhorst. “The Germanium Quantum Information Route.” Nature Reviews
Materials. Springer Nature, 2021. https://doi.org/10.1038/s41578-020-00262-z.
ieee: G. Scappucci et al., “The germanium quantum information route,” Nature
Reviews Materials, vol. 6. Springer Nature, pp. 926–943, 2021.
ista: Scappucci G, Kloeffel C, Zwanenburg FA, Loss D, Myronov M, Zhang J-J, Franceschi
SD, Katsaros G, Veldhorst M. 2021. The germanium quantum information route. Nature
Reviews Materials. 6, 926–943.
mla: Scappucci, Giordano, et al. “The Germanium Quantum Information Route.” Nature
Reviews Materials, vol. 6, Springer Nature, 2021, pp. 926–943, doi:10.1038/s41578-020-00262-z.
short: G. Scappucci, C. Kloeffel, F.A. Zwanenburg, D. Loss, M. Myronov, J.-J. Zhang,
S.D. Franceschi, G. Katsaros, M. Veldhorst, Nature Reviews Materials 6 (2021)
926–943.
date_created: 2020-12-02T10:52:51Z
date_published: 2021-10-01T00:00:00Z
date_updated: 2024-03-07T14:48:57Z
day: '01'
department:
- _id: GeKa
doi: 10.1038/s41578-020-00262-z
ec_funded: 1
external_id:
arxiv:
- '2004.08133'
isi:
- '000600826100003'
intvolume: ' 6'
isi: 1
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2004.08133
month: '10'
oa: 1
oa_version: Preprint
page: '926–943 '
project:
- _id: 25517E86-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '335497'
name: Towards Spin qubits and Majorana fermions in Germanium selfassembled hut-wires
- _id: 2552F888-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: Y00715
name: Loch Spin-Qubits und Majorana-Fermionen in Germanium
- _id: 2641CE5E-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P30207
name: Hole spin orbit qubits in Ge quantum wells
publication: Nature Reviews Materials
publication_identifier:
eissn:
- 2058-8437
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: The germanium quantum information route
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 6
year: '2021'
...
---
_id: '9291'
abstract:
- lang: eng
text: "This .zip File contains the transport data for figures presented in the main
text and supplementary material of \"Enhancement of Proximity Induced Superconductivity
in Planar Germanium\" by K. Aggarwal, et. al. \r\nThe measurements were done using
Labber Software and the data is stored in the hdf5 file format. The files can
be opened using either the Labber Log Browser (https://labber.org/overview/) or
Labber Python API (http://labber.org/online-doc/api/LogFile.html)."
article_processing_charge: No
author:
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
citation:
ama: 'Katsaros G. Raw transport data for: Enhancement of proximity induced superconductivity
in planar germanium. 2021. doi:10.15479/AT:ISTA:9291'
apa: 'Katsaros, G. (2021). Raw transport data for: Enhancement of proximity induced
superconductivity in planar germanium. Institute of Science and Technology Austria.
https://doi.org/10.15479/AT:ISTA:9291'
chicago: 'Katsaros, Georgios. “Raw Transport Data for: Enhancement of Proximity
Induced Superconductivity in Planar Germanium.” Institute of Science and Technology
Austria, 2021. https://doi.org/10.15479/AT:ISTA:9291.'
ieee: 'G. Katsaros, “Raw transport data for: Enhancement of proximity induced superconductivity
in planar germanium.” Institute of Science and Technology Austria, 2021.'
ista: 'Katsaros G. 2021. Raw transport data for: Enhancement of proximity induced
superconductivity in planar germanium, Institute of Science and Technology Austria,
10.15479/AT:ISTA:9291.'
mla: 'Katsaros, Georgios. Raw Transport Data for: Enhancement of Proximity Induced
Superconductivity in Planar Germanium. Institute of Science and Technology
Austria, 2021, doi:10.15479/AT:ISTA:9291.'
short: G. Katsaros, (2021).
date_created: 2021-03-27T13:47:49Z
date_published: 2021-03-29T00:00:00Z
date_updated: 2024-02-21T12:37:14Z
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month: '03'
oa: 1
oa_version: Published Version
publisher: Institute of Science and Technology Austria
status: public
title: 'Raw transport data for: Enhancement of proximity induced superconductivity
in planar germanium'
tmp:
image: /images/cc_0.png
legal_code_url: https://creativecommons.org/publicdomain/zero/1.0/legalcode
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short: CC0 (1.0)
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...
---
_id: '9323'
abstract:
- lang: eng
text: This .zip File contains the data for figures presented in the main text and
supplementary material of "A singlet triplet hole spin qubit in planar Ge" by
D. Jirovec, et. al. The measurements were done using Labber Software and the data
is stored in the hdf5 file format. The files can be opened using either the Labber
Log Browser (https://labber.org/overview/) or Labber Python API (http://labber.org/online-doc/api/LogFile.html).
A single file is acquired with QCodes and features the corresponding data type.
XRD data are in .dat format and a code to open the data is provided. The code
for simulations is as well provided in Python.
article_processing_charge: No
author:
- first_name: Daniel
full_name: Jirovec, Daniel
id: 4C473F58-F248-11E8-B48F-1D18A9856A87
last_name: Jirovec
orcid: 0000-0002-7197-4801
citation:
ama: Jirovec D. Research data for “A singlet-triplet hole spin qubit planar Ge.”
2021. doi:10.15479/AT:ISTA:9323
apa: Jirovec, D. (2021). Research data for “A singlet-triplet hole spin qubit planar
Ge.” Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:9323
chicago: Jirovec, Daniel. “Research Data for ‘A Singlet-Triplet Hole Spin Qubit
Planar Ge.’” Institute of Science and Technology Austria, 2021. https://doi.org/10.15479/AT:ISTA:9323.
ieee: D. Jirovec, “Research data for ‘A singlet-triplet hole spin qubit planar Ge.’”
Institute of Science and Technology Austria, 2021.
ista: Jirovec D. 2021. Research data for ‘A singlet-triplet hole spin qubit planar
Ge’, Institute of Science and Technology Austria, 10.15479/AT:ISTA:9323.
mla: Jirovec, Daniel. Research Data for “A Singlet-Triplet Hole Spin Qubit Planar
Ge.” Institute of Science and Technology Austria, 2021, doi:10.15479/AT:ISTA:9323.
short: D. Jirovec, (2021).
contributor:
- contributor_type: project_member
first_name: Daniel
id: 4C473F58-F248-11E8-B48F-1D18A9856A87
last_name: Jirovec
date_created: 2021-04-14T09:50:22Z
date_published: 2021-04-14T00:00:00Z
date_updated: 2024-02-21T12:39:15Z
day: '14'
ddc:
- '530'
department:
- _id: GradSch
- _id: GeKa
doi: 10.15479/AT:ISTA:9323
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- access_level: open_access
checksum: c569d2a2ce1694445cdbca19cf8ae023
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creator: djirovec
date_created: 2021-04-14T09:48:47Z
date_updated: 2021-04-14T09:48:47Z
file_id: '9324'
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file_size: 221832287
relation: main_file
success: 1
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content_type: application/octet-stream
creator: djirovec
date_created: 2021-04-14T09:49:30Z
date_updated: 2021-04-14T09:49:30Z
file_id: '9325'
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file_size: 4323
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file_date_updated: 2021-04-14T09:49:30Z
has_accepted_license: '1'
month: '04'
oa: 1
oa_version: Published Version
publisher: Institute of Science and Technology Austria
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- id: '8909'
relation: used_in_publication
status: public
status: public
title: Research data for "A singlet-triplet hole spin qubit planar Ge"
tmp:
image: /images/cc_0.png
legal_code_url: https://creativecommons.org/publicdomain/zero/1.0/legalcode
name: Creative Commons Public Domain Dedication (CC0 1.0)
short: CC0 (1.0)
type: research_data
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2021'
...
---
_id: '9389'
abstract:
- lang: eng
text: "This .zip File contains the transport data for \"Non-topological zero bias
peaks in full-shell nanowires induced by flux tunable Andreev states\" by M. Valentini,
et. al. \r\nThe measurements were done using Labber Software and the data is
stored in the hdf5 file format.\r\nInstructions of how to read the data are in
\"Notebook_Valentini.pdf\"."
acknowledged_ssus:
- _id: NanoFab
article_processing_charge: No
author:
- first_name: Marco
full_name: Valentini, Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
citation:
ama: Valentini M. Research data for “Non-topological zero bias peaks in full-shell
nanowires induced by flux tunable Andreev states.” 2021. doi:10.15479/AT:ISTA:9389
apa: Valentini, M. (2021). Research data for “Non-topological zero bias peaks in
full-shell nanowires induced by flux tunable Andreev states.” Institute of Science
and Technology Austria. https://doi.org/10.15479/AT:ISTA:9389
chicago: Valentini, Marco. “Research Data for ‘Non-Topological Zero Bias Peaks in
Full-Shell Nanowires Induced by Flux Tunable Andreev States.’” Institute of Science
and Technology Austria, 2021. https://doi.org/10.15479/AT:ISTA:9389.
ieee: M. Valentini, “Research data for ‘Non-topological zero bias peaks in full-shell
nanowires induced by flux tunable Andreev states.’” Institute of Science and Technology
Austria, 2021.
ista: Valentini M. 2021. Research data for ‘Non-topological zero bias peaks in full-shell
nanowires induced by flux tunable Andreev states’, Institute of Science and Technology
Austria, 10.15479/AT:ISTA:9389.
mla: Valentini, Marco. Research Data for “Non-Topological Zero Bias Peaks in
Full-Shell Nanowires Induced by Flux Tunable Andreev States.” Institute of
Science and Technology Austria, 2021, doi:10.15479/AT:ISTA:9389.
short: M. Valentini, (2021).
contributor:
- contributor_type: contact_person
first_name: Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
date_created: 2021-05-14T12:07:53Z
date_published: 2021-01-01T00:00:00Z
date_updated: 2024-02-21T12:40:09Z
ddc:
- '530'
department:
- _id: GradSch
- _id: GeKa
doi: 10.15479/AT:ISTA:9389
file:
- access_level: open_access
checksum: 80a905c4eef24dab6fb247e81a3d67f5
content_type: application/pdf
creator: mvalenti
date_created: 2021-05-14T11:42:23Z
date_updated: 2021-05-14T11:42:23Z
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file_name: Notebook_Valentini.pdf
file_size: 10572981
relation: main_file
- access_level: open_access
checksum: 1e61a7e63949448a8db0091cdac23570
content_type: application/x-zip-compressed
creator: mvalenti
date_created: 2021-05-14T11:56:48Z
date_updated: 2021-05-14T11:56:48Z
file_id: '9391'
file_name: Experimental_data.zip
file_size: 99076111
relation: main_file
file_date_updated: 2021-05-14T11:56:48Z
has_accepted_license: '1'
oa: 1
oa_version: Published Version
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '8910'
relation: used_in_publication
status: public
status: public
title: Research data for "Non-topological zero bias peaks in full-shell nanowires
induced by flux tunable Andreev states"
tmp:
image: /images/cc_0.png
legal_code_url: https://creativecommons.org/publicdomain/zero/1.0/legalcode
name: Creative Commons Public Domain Dedication (CC0 1.0)
short: CC0 (1.0)
type: research_data
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2021'
...
---
_id: '9464'
abstract:
- lang: eng
text: We firstly introduce the self-assembled growth of highly uniform Ge quantum
wires with controllable position, distance and length on patterned Si (001) substrates.
We then present the electrically tunable strong spin-orbit coupling, the first
Ge hole spin qubit and ultrafast operation of hole spin qubit in the Ge/Si quantum
wires.
acknowledgement: This work was supported by the National Key R&D Program of China
(Grant No. 2016YFA0301700) and the ERC Starting Grant no. 335497.
article_number: '9420817'
article_processing_charge: No
author:
- first_name: Fei
full_name: Gao, Fei
last_name: Gao
- first_name: Jie Yin
full_name: Zhang, Jie Yin
last_name: Zhang
- first_name: Jian Huan
full_name: Wang, Jian Huan
last_name: Wang
- first_name: Ming
full_name: Ming, Ming
last_name: Ming
- first_name: Tina
full_name: Wang, Tina
last_name: Wang
- first_name: Jian Jun
full_name: Zhang, Jian Jun
last_name: Zhang
- first_name: Hannes
full_name: Watzinger, Hannes
id: 35DF8E50-F248-11E8-B48F-1D18A9856A87
last_name: Watzinger
- first_name: Josip
full_name: Kukucka, Josip
id: 3F5D8856-F248-11E8-B48F-1D18A9856A87
last_name: Kukucka
- first_name: Lada
full_name: Vukušić, Lada
id: 31E9F056-F248-11E8-B48F-1D18A9856A87
last_name: Vukušić
orcid: 0000-0003-2424-8636
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
- first_name: Ke
full_name: Wang, Ke
last_name: Wang
- first_name: Gang
full_name: Xu, Gang
last_name: Xu
- first_name: Hai Ou
full_name: Li, Hai Ou
last_name: Li
- first_name: Guo Ping
full_name: Guo, Guo Ping
last_name: Guo
citation:
ama: 'Gao F, Zhang JY, Wang JH, et al. Ge/Si quantum wires for quantum computing.
In: 2021 5th IEEE Electron Devices Technology and Manufacturing Conference,
EDTM 2021. IEEE; 2021. doi:10.1109/EDTM50988.2021.9420817'
apa: 'Gao, F., Zhang, J. Y., Wang, J. H., Ming, M., Wang, T., Zhang, J. J., … Guo,
G. P. (2021). Ge/Si quantum wires for quantum computing. In 2021 5th IEEE Electron
Devices Technology and Manufacturing Conference, EDTM 2021. Virtual, Online:
IEEE. https://doi.org/10.1109/EDTM50988.2021.9420817'
chicago: Gao, Fei, Jie Yin Zhang, Jian Huan Wang, Ming Ming, Tina Wang, Jian Jun
Zhang, Hannes Watzinger, et al. “Ge/Si Quantum Wires for Quantum Computing.” In
2021 5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM
2021. IEEE, 2021. https://doi.org/10.1109/EDTM50988.2021.9420817.
ieee: F. Gao et al., “Ge/Si quantum wires for quantum computing,” in 2021
5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM 2021,
Virtual, Online, 2021.
ista: 'Gao F, Zhang JY, Wang JH, Ming M, Wang T, Zhang JJ, Watzinger H, Kukucka
J, Vukušić L, Katsaros G, Wang K, Xu G, Li HO, Guo GP. 2021. Ge/Si quantum wires
for quantum computing. 2021 5th IEEE Electron Devices Technology and Manufacturing
Conference, EDTM 2021. EDTM: IEEE Electron Devices Technology and Manufacturing
Conference, 9420817.'
mla: Gao, Fei, et al. “Ge/Si Quantum Wires for Quantum Computing.” 2021 5th IEEE
Electron Devices Technology and Manufacturing Conference, EDTM 2021, 9420817,
IEEE, 2021, doi:10.1109/EDTM50988.2021.9420817.
short: F. Gao, J.Y. Zhang, J.H. Wang, M. Ming, T. Wang, J.J. Zhang, H. Watzinger,
J. Kukucka, L. Vukušić, G. Katsaros, K. Wang, G. Xu, H.O. Li, G.P. Guo, in:, 2021
5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM 2021,
IEEE, 2021.
conference:
end_date: 2021-04-11
location: Virtual, Online
name: 'EDTM: IEEE Electron Devices Technology and Manufacturing Conference'
start_date: 2021-04-08
date_created: 2021-06-06T22:01:29Z
date_published: 2021-04-08T00:00:00Z
date_updated: 2023-10-03T12:51:59Z
day: '08'
department:
- _id: GeKa
doi: 10.1109/EDTM50988.2021.9420817
ec_funded: 1
external_id:
isi:
- '000675595800006'
isi: 1
language:
- iso: eng
month: '04'
oa_version: None
project:
- _id: 25517E86-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '335497'
name: Towards Spin qubits and Majorana fermions in Germanium selfassembled hut-wires
publication: 2021 5th IEEE Electron Devices Technology and Manufacturing Conference,
EDTM 2021
publication_identifier:
isbn:
- '9781728181769'
publication_status: published
publisher: IEEE
quality_controlled: '1'
scopus_import: '1'
status: public
title: Ge/Si quantum wires for quantum computing
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2021'
...
---
_id: '10058'
abstract:
- lang: eng
text: 'Quantum information and computation has become a vast field paved with opportunities
for researchers and investors. As large multinational companies and international
funds are heavily investing in quantum technologies it is still a question which
platform is best suited for the task of realizing a scalable quantum processor.
In this work we investigate hole spins in Ge quantum wells. These hold great promise
as they possess several favorable properties: a small effective mass, a strong
spin-orbit coupling, long relaxation time and an inherent immunity to hyperfine
noise. All these characteristics helped Ge hole spin qubits to evolve from a single
qubit to a fully entangled four qubit processor in only 3 years. Here, we investigated
a qubit approach leveraging the large out-of-plane g-factors of heavy hole states
in Ge quantum dots. We found this qubit to be reproducibly operable at extremely
low magnetic field and at large speeds while maintaining coherence. This was possible
because large differences of g-factors in adjacent dots can be achieved in the
out-of-plane direction. In the in-plane direction the small g-factors, on the
other hand, can be altered very effectively by the confinement potentials. Here,
we found that this can even lead to a sign change of the g-factors. The resulting
g-factor difference alters the dynamics of the system drastically and produces
effects typically attributed to a spin-orbit induced spin-flip term. The investigations
carried out in this thesis give further insights into the possibilities of holes
in Ge and reveal new physical properties that need to be considered when designing
future spin qubit experiments.'
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: The author gratefully acknowledges support by the Austrian Science
Fund (FWF), grants No P30207, and the Nomis foundation.
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Daniel
full_name: Jirovec, Daniel
id: 4C473F58-F248-11E8-B48F-1D18A9856A87
last_name: Jirovec
orcid: 0000-0002-7197-4801
citation:
ama: Jirovec D. Singlet-Triplet qubits and spin-orbit interaction in 2-dimensional
Ge hole gases. 2021. doi:10.15479/at:ista:10058
apa: Jirovec, D. (2021). Singlet-Triplet qubits and spin-orbit interaction in
2-dimensional Ge hole gases. Institute of Science and Technology Austria.
https://doi.org/10.15479/at:ista:10058
chicago: Jirovec, Daniel. “Singlet-Triplet Qubits and Spin-Orbit Interaction in
2-Dimensional Ge Hole Gases.” Institute of Science and Technology Austria, 2021.
https://doi.org/10.15479/at:ista:10058.
ieee: D. Jirovec, “Singlet-Triplet qubits and spin-orbit interaction in 2-dimensional
Ge hole gases,” Institute of Science and Technology Austria, 2021.
ista: Jirovec D. 2021. Singlet-Triplet qubits and spin-orbit interaction in 2-dimensional
Ge hole gases. Institute of Science and Technology Austria.
mla: Jirovec, Daniel. Singlet-Triplet Qubits and Spin-Orbit Interaction in 2-Dimensional
Ge Hole Gases. Institute of Science and Technology Austria, 2021, doi:10.15479/at:ista:10058.
short: D. Jirovec, Singlet-Triplet Qubits and Spin-Orbit Interaction in 2-Dimensional
Ge Hole Gases, Institute of Science and Technology Austria, 2021.
date_created: 2021-09-30T07:53:49Z
date_published: 2021-10-05T00:00:00Z
date_updated: 2023-09-08T11:41:08Z
day: '05'
ddc:
- '621'
- '539'
degree_awarded: PhD
department:
- _id: GradSch
- _id: GeKa
doi: 10.15479/at:ista:10058
file:
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content_type: application/x-zip-compressed
creator: djirovec
date_created: 2021-09-30T14:29:14Z
date_updated: 2022-12-20T23:30:07Z
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file_size: 32397600
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content_type: application/pdf
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date_created: 2021-10-05T07:56:49Z
date_updated: 2022-12-20T23:30:07Z
embargo: 2022-10-06
file_id: '10087'
file_name: PHD_Thesis_pdfa2b_1.pdf
file_size: 26910829
relation: main_file
file_date_updated: 2022-12-20T23:30:07Z
has_accepted_license: '1'
keyword:
- qubits
- quantum computing
- holes
language:
- iso: eng
month: '10'
oa: 1
oa_version: Published Version
page: '151'
project:
- _id: 2641CE5E-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P30207
name: Hole spin orbit qubits in Ge quantum wells
publication_identifier:
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '8831'
relation: part_of_dissertation
status: public
- id: '10065'
relation: part_of_dissertation
status: public
- id: '10066'
relation: part_of_dissertation
status: public
- id: '8909'
relation: part_of_dissertation
status: public
- id: '5816'
relation: part_of_dissertation
status: public
status: public
supervisor:
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
title: Singlet-Triplet qubits and spin-orbit interaction in 2-dimensional Ge hole
gases
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: dissertation
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
year: '2021'
...
---
_id: '10066'
abstract:
- lang: eng
text: The potential of Si and SiGe-based devices for the scaling of quantum circuits
is tainted by device variability. Each device needs to be tuned to operation conditions.
We give a key step towards tackling this variability with an algorithm that, without
modification, is capable of tuning a 4-gate Si FinFET, a 5-gate GeSi nanowire
and a 7-gate SiGe heterostructure double quantum dot device from scratch. We achieve
tuning times of 30, 10, and 92 minutes, respectively. The algorithm also provides
insight into the parameter space landscape for each of these devices. These results
show that overarching solutions for the tuning of quantum devices are enabled
by machine learning.
acknowledged_ssus:
- _id: NanoFab
acknowledgement: "We acknowledge Ang Li, Erik P. A. M. Bakkers (University of Eindhoven)
for the fabrication of the Ge/Si nanowire. This work was supported by the Royal
Society, the EPSRC National Quantum Technology Hub in Networked Quantum Information
Technology (EP/M013243/1), Quantum Technology Capital (EP/N014995/1), EPSRC Platform
Grant\r\n(EP/R029229/1), the European Research Council (Grant agreement 948932),
the Swiss Nanoscience Institute, the\r\nNCCR SPIN, the EU H2020 European Microkelvin
Platform EMP grant No. 824109, the Scientific Service Units\r\nof IST Austria through
resources provided by the nanofabrication facility and, the FWF-P30207 project.
This publication was also made possible through support from Templeton World Charity
Foundation and John Templeton Foundation. The opinions expressed in this publication
are those of the authors and do not necessarily reflect the views of the Templeton
Foundations."
article_number: '2107.12975'
article_processing_charge: No
arxiv: 1
author:
- first_name: B.
full_name: Severin, B.
last_name: Severin
- first_name: D. T.
full_name: Lennon, D. T.
last_name: Lennon
- first_name: L. C.
full_name: Camenzind, L. C.
last_name: Camenzind
- first_name: F.
full_name: Vigneau, F.
last_name: Vigneau
- first_name: F.
full_name: Fedele, F.
last_name: Fedele
- first_name: Daniel
full_name: Jirovec, Daniel
id: 4C473F58-F248-11E8-B48F-1D18A9856A87
last_name: Jirovec
orcid: 0000-0002-7197-4801
- first_name: A.
full_name: Ballabio, A.
last_name: Ballabio
- first_name: D.
full_name: Chrastina, D.
last_name: Chrastina
- first_name: G.
full_name: Isella, G.
last_name: Isella
- first_name: M. de
full_name: Kruijf, M. de
last_name: Kruijf
- first_name: M. J.
full_name: Carballido, M. J.
last_name: Carballido
- first_name: S.
full_name: Svab, S.
last_name: Svab
- first_name: A. V.
full_name: Kuhlmann, A. V.
last_name: Kuhlmann
- first_name: F. R.
full_name: Braakman, F. R.
last_name: Braakman
- first_name: S.
full_name: Geyer, S.
last_name: Geyer
- first_name: F. N. M.
full_name: Froning, F. N. M.
last_name: Froning
- first_name: H.
full_name: Moon, H.
last_name: Moon
- first_name: M. A.
full_name: Osborne, M. A.
last_name: Osborne
- first_name: D.
full_name: Sejdinovic, D.
last_name: Sejdinovic
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
- first_name: D. M.
full_name: Zumbühl, D. M.
last_name: Zumbühl
- first_name: G. A. D.
full_name: Briggs, G. A. D.
last_name: Briggs
- first_name: N.
full_name: Ares, N.
last_name: Ares
citation:
ama: Severin B, Lennon DT, Camenzind LC, et al. Cross-architecture tuning of silicon
and SiGe-based quantum devices using machine learning. arXiv. doi:10.48550/arXiv.2107.12975
apa: Severin, B., Lennon, D. T., Camenzind, L. C., Vigneau, F., Fedele, F., Jirovec,
D., … Ares, N. (n.d.). Cross-architecture tuning of silicon and SiGe-based quantum
devices using machine learning. arXiv. https://doi.org/10.48550/arXiv.2107.12975
chicago: Severin, B., D. T. Lennon, L. C. Camenzind, F. Vigneau, F. Fedele, Daniel
Jirovec, A. Ballabio, et al. “Cross-Architecture Tuning of Silicon and SiGe-Based
Quantum Devices Using Machine Learning.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2107.12975.
ieee: B. Severin et al., “Cross-architecture tuning of silicon and SiGe-based
quantum devices using machine learning,” arXiv. .
ista: Severin B, Lennon DT, Camenzind LC, Vigneau F, Fedele F, Jirovec D, Ballabio
A, Chrastina D, Isella G, Kruijf M de, Carballido MJ, Svab S, Kuhlmann AV, Braakman
FR, Geyer S, Froning FNM, Moon H, Osborne MA, Sejdinovic D, Katsaros G, Zumbühl
DM, Briggs GAD, Ares N. Cross-architecture tuning of silicon and SiGe-based quantum
devices using machine learning. arXiv, 2107.12975.
mla: Severin, B., et al. “Cross-Architecture Tuning of Silicon and SiGe-Based Quantum
Devices Using Machine Learning.” ArXiv, 2107.12975, doi:10.48550/arXiv.2107.12975.
short: B. Severin, D.T. Lennon, L.C. Camenzind, F. Vigneau, F. Fedele, D. Jirovec,
A. Ballabio, D. Chrastina, G. Isella, M. de Kruijf, M.J. Carballido, S. Svab,
A.V. Kuhlmann, F.R. Braakman, S. Geyer, F.N.M. Froning, H. Moon, M.A. Osborne,
D. Sejdinovic, G. Katsaros, D.M. Zumbühl, G.A.D. Briggs, N. Ares, ArXiv (n.d.).
date_created: 2021-10-01T12:40:22Z
date_published: 2021-07-27T00:00:00Z
date_updated: 2024-03-25T23:30:14Z
day: '27'
department:
- _id: GeKa
doi: 10.48550/arXiv.2107.12975
external_id:
arxiv:
- '2107.12975'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2107.12975
month: '07'
oa: 1
oa_version: Preprint
project:
- _id: 2641CE5E-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P30207
name: Hole spin orbit qubits in Ge quantum wells
publication: arXiv
publication_status: submitted
related_material:
record:
- id: '10058'
relation: dissertation_contains
status: public
status: public
title: Cross-architecture tuning of silicon and SiGe-based quantum devices using machine
learning
type: preprint
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2021'
...
---
_id: '10559'
abstract:
- lang: eng
text: Hole gases in planar germanium can have high mobilities in combination with
strong spin-orbit interaction and electrically tunable g factors, and are therefore
emerging as a promising platform for creating hybrid superconductor-semiconductor
devices. A key challenge towards hybrid Ge-based quantum technologies is the design
of high-quality interfaces and superconducting contacts that are robust against
magnetic fields. In this work, by combining the assets of aluminum, which provides
good contact to the Ge, and niobium, which has a significant superconducting gap,
we demonstrate highly transparent low-disordered JoFETs with relatively large
ICRN products that are capable of withstanding high magnetic fields. We furthermore
demonstrate the ability of phase-biasing individual JoFETs, opening up an avenue
to explore topological superconductivity in planar Ge. The persistence of superconductivity
in the reported hybrid devices beyond 1.8 T paves the way towards integrating
spin qubits and proximity-induced superconductivity on the same chip.
acknowledged_ssus:
- _id: NanoFab
- _id: M-Shop
acknowledgement: This research and related results were made possible with the support
of the NOMIS Foundation. This research was supported by the Scientific Service Units
of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication
facility, the European Union's Horizon 2020 research and innovation program under
the Marie Sklodowska-Curie Grant agreement No. 844511 Grant Agreement No. 862046.
ICN2 acknowledge funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported
by the Severo Ochoa program from Spanish MINECO (Grant No. SEV-2017-0706) and is
funded by the CERCA Programme/Generalitat de Catalunya. Part of the present work
has been performed in the framework of Universitat Autnoma de Barcelona Materials
Science PhD program. The HAADF-STEM microscopy was conducted in the Laboratorio
de Microscopias Avanzadas at Instituto de Nanociencia de Aragon-Universidad de Zaragoza.
Authors acknowledge the LMA-INA for offering access to their instruments and expertise.
We acknowledge support from CSIC Research Platform on Quantum Technologies PTI-001.
This project has received funding from the European Union's Horizon 2020 research
and innovation programme under Grant Agreement No. 823717 ESTEEM3. M.B. acknowledges
support from SUR Generalitat de Catalunya and the EU Social Fund; project ref. 2020
FI 00103. G.S. and M.V. acknowledge support through a projectruimte grant associated
with the Netherlands Organization of Scientific Research (NWO). J.D. acknowledges
support through FRIPRO-project 274853, which is funded by the Research Council of
Norway.
article_number: L022005
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Kushagra
full_name: Aggarwal, Kushagra
id: b22ab905-3539-11eb-84c3-fc159dcd79cb
last_name: Aggarwal
orcid: 0000-0001-9985-9293
- first_name: Andrea C
full_name: Hofmann, Andrea C
id: 340F461A-F248-11E8-B48F-1D18A9856A87
last_name: Hofmann
- first_name: Daniel
full_name: Jirovec, Daniel
id: 4C473F58-F248-11E8-B48F-1D18A9856A87
last_name: Jirovec
orcid: 0000-0002-7197-4801
- first_name: Ivan
full_name: Prieto Gonzalez, Ivan
id: 2A307FE2-F248-11E8-B48F-1D18A9856A87
last_name: Prieto Gonzalez
orcid: 0000-0002-7370-5357
- first_name: Amir
full_name: Sammak, Amir
last_name: Sammak
- first_name: Marc
full_name: Botifoll, Marc
last_name: Botifoll
- first_name: Sara
full_name: Martí-Sánchez, Sara
last_name: Martí-Sánchez
- first_name: Menno
full_name: Veldhorst, Menno
last_name: Veldhorst
- first_name: Jordi
full_name: Arbiol, Jordi
last_name: Arbiol
- first_name: Giordano
full_name: Scappucci, Giordano
last_name: Scappucci
- first_name: Jeroen
full_name: Danon, Jeroen
last_name: Danon
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
citation:
ama: Aggarwal K, Hofmann AC, Jirovec D, et al. Enhancement of proximity-induced
superconductivity in a planar Ge hole gas. Physical Review Research. 2021;3(2).
doi:10.1103/physrevresearch.3.l022005
apa: Aggarwal, K., Hofmann, A. C., Jirovec, D., Prieto Gonzalez, I., Sammak, A.,
Botifoll, M., … Katsaros, G. (2021). Enhancement of proximity-induced superconductivity
in a planar Ge hole gas. Physical Review Research. American Physical Society.
https://doi.org/10.1103/physrevresearch.3.l022005
chicago: Aggarwal, Kushagra, Andrea C Hofmann, Daniel Jirovec, Ivan Prieto Gonzalez,
Amir Sammak, Marc Botifoll, Sara Martí-Sánchez, et al. “Enhancement of Proximity-Induced
Superconductivity in a Planar Ge Hole Gas.” Physical Review Research. American
Physical Society, 2021. https://doi.org/10.1103/physrevresearch.3.l022005.
ieee: K. Aggarwal et al., “Enhancement of proximity-induced superconductivity
in a planar Ge hole gas,” Physical Review Research, vol. 3, no. 2. American
Physical Society, 2021.
ista: Aggarwal K, Hofmann AC, Jirovec D, Prieto Gonzalez I, Sammak A, Botifoll M,
Martí-Sánchez S, Veldhorst M, Arbiol J, Scappucci G, Danon J, Katsaros G. 2021.
Enhancement of proximity-induced superconductivity in a planar Ge hole gas. Physical
Review Research. 3(2), L022005.
mla: Aggarwal, Kushagra, et al. “Enhancement of Proximity-Induced Superconductivity
in a Planar Ge Hole Gas.” Physical Review Research, vol. 3, no. 2, L022005,
American Physical Society, 2021, doi:10.1103/physrevresearch.3.l022005.
short: K. Aggarwal, A.C. Hofmann, D. Jirovec, I. Prieto Gonzalez, A. Sammak, M.
Botifoll, S. Martí-Sánchez, M. Veldhorst, J. Arbiol, G. Scappucci, J. Danon, G.
Katsaros, Physical Review Research 3 (2021).
date_created: 2021-12-16T18:50:57Z
date_published: 2021-04-15T00:00:00Z
date_updated: 2024-02-21T12:41:26Z
day: '15'
ddc:
- '620'
department:
- _id: GeKa
doi: 10.1103/physrevresearch.3.l022005
ec_funded: 1
external_id:
arxiv:
- '2012.00322'
file:
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creator: cchlebak
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date_updated: 2021-12-17T08:12:37Z
file_id: '10561'
file_name: 2021_PhysRevResearch_Aggarwal.pdf
file_size: 1917512
relation: main_file
success: 1
file_date_updated: 2021-12-17T08:12:37Z
has_accepted_license: '1'
intvolume: ' 3'
issue: '2'
keyword:
- general engineering
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
project:
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '844511'
name: Majorana bound states in Ge/SiGe heterostructures
- _id: 237E5020-32DE-11EA-91FC-C7463DDC885E
call_identifier: H2020
grant_number: '862046'
name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS
publication: Physical Review Research
publication_identifier:
issn:
- 2643-1564
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
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status: public
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relation: research_data
status: public
scopus_import: '1'
status: public
title: Enhancement of proximity-induced superconductivity in a planar Ge hole gas
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 3
year: '2021'
...
---
_id: '7996'
abstract:
- lang: eng
text: "Quantum computation enables the execution of algorithms that have exponential
complexity. This might open the path towards the synthesis of new materials or
medical drugs, optimization of transport or financial strategies etc., intractable
on even the fastest classical computers. A quantum computer consists of interconnected
two level quantum systems, called qubits, that satisfy DiVincezo’s criteria. Worldwide,
there are ongoing efforts to find the qubit architecture which will unite quantum
error correction compatible single and two qubit fidelities, long distance qubit
to qubit coupling and \r\n calability. Superconducting qubits have gone the furthest
in this race, demonstrating an algorithm running on 53 coupled qubits, but still
the fidelities are not even close to those required for realizing a single logical
qubit. emiconductor qubits offer extremely good characteristics, but they are
currently investigated across different platforms. Uniting those good characteristics
into a single platform might be a big step towards the quantum computer realization.\r\nHere
we describe the implementation of a hole spin qubit hosted in a Ge hut wire double
quantum dot. The high and tunable spin-orbit coupling together with a heavy hole
state character is expected to allow fast spin manipulation and long coherence
times. Furthermore large lever arms, for hut wire devices, should allow good coupling
to superconducting resonators enabling efficient long distance spin to spin coupling
and a sensitive gate reflectometry spin readout. The developed cryogenic setup
(printed circuit board sample holders, filtering, high-frequency wiring) enabled
us to perform low temperature spin dynamics experiments. Indeed, we measured the
fastest single spin qubit Rabi frequencies reported so far, reaching 140 MHz,
while the dephasing times of 130 ns oppose the long decoherence predictions. In
order to further investigate this, a double quantum dot gate was connected directly
to a lumped element\r\nresonator which enabled gate reflectometry readout. The
vanishing inter-dot transition signal, for increasing external magnetic field,
revealed the spin nature of the measured quantity."
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Josip
full_name: Kukucka, Josip
id: 3F5D8856-F248-11E8-B48F-1D18A9856A87
last_name: Kukucka
citation:
ama: Kukucka J. Implementation of a hole spin qubit in Ge hut wires and dispersive
spin sensing. 2020. doi:10.15479/AT:ISTA:7996
apa: Kukucka, J. (2020). Implementation of a hole spin qubit in Ge hut wires
and dispersive spin sensing. Institute of Science and Technology Austria.
https://doi.org/10.15479/AT:ISTA:7996
chicago: Kukucka, Josip. “Implementation of a Hole Spin Qubit in Ge Hut Wires and
Dispersive Spin Sensing.” Institute of Science and Technology Austria, 2020. https://doi.org/10.15479/AT:ISTA:7996.
ieee: J. Kukucka, “Implementation of a hole spin qubit in Ge hut wires and dispersive
spin sensing,” Institute of Science and Technology Austria, 2020.
ista: Kukucka J. 2020. Implementation of a hole spin qubit in Ge hut wires and dispersive
spin sensing. Institute of Science and Technology Austria.
mla: Kukucka, Josip. Implementation of a Hole Spin Qubit in Ge Hut Wires and
Dispersive Spin Sensing. Institute of Science and Technology Austria, 2020,
doi:10.15479/AT:ISTA:7996.
short: J. Kukucka, Implementation of a Hole Spin Qubit in Ge Hut Wires and Dispersive
Spin Sensing, Institute of Science and Technology Austria, 2020.
date_created: 2020-06-22T09:22:23Z
date_published: 2020-06-22T00:00:00Z
date_updated: 2023-09-26T15:50:22Z
day: '22'
ddc:
- '530'
degree_awarded: PhD
department:
- _id: GeKa
doi: 10.15479/AT:ISTA:7996
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checksum: 467e52feb3e361ce8cf5fe8d5c254ece
content_type: application/x-zip-compressed
creator: dernst
date_created: 2020-06-22T09:22:04Z
date_updated: 2020-07-14T12:48:07Z
file_id: '7997'
file_name: JK_thesis_latex_source_files.zip
file_size: 392794743
relation: main_file
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checksum: 1de716bf110dbd77d383e479232bf496
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file_id: '7998'
file_name: PhD_thesis_JK_pdfa.pdf
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file_date_updated: 2020-07-14T12:48:07Z
has_accepted_license: '1'
language:
- iso: eng
month: '06'
oa: 1
oa_version: Published Version
page: '178'
publication_identifier:
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '1328'
relation: part_of_dissertation
status: public
- id: '7541'
relation: part_of_dissertation
status: public
- id: '77'
relation: part_of_dissertation
status: public
- id: '23'
relation: part_of_dissertation
status: public
- id: '840'
relation: part_of_dissertation
status: public
status: public
supervisor:
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
title: Implementation of a hole spin qubit in Ge hut wires and dispersive spin sensing
type: dissertation
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
year: '2020'
...
---
_id: '8203'
abstract:
- lang: eng
text: Using inelastic cotunneling spectroscopy we observe a zero field splitting
within the spin triplet manifold of Ge hut wire quantum dots. The states with
spin ±1 in the confinement direction are energetically favored by up to 55 μeV
compared to the spin 0 triplet state because of the strong spin–orbit coupling.
The reported effect should be observable in a broad class of strongly confined
hole quantum-dot systems and might need to be considered when operating hole spin
qubits.
acknowledged_ssus:
- _id: NanoFab
- _id: M-Shop
acknowledgement: "We acknowledge G. Burkard, V. N. Golovach, C. Kloeffel, D.Loss,
P. Rabl, and M. Rancič ́ for helpful discussions. We\r\nfurther acknowledge T.
Adletzberger, J. Aguilera, T. Asenov, S. Bagiante, T. Menner, L. Shafeek, P. Taus,
P. Traunmüller, and D. Waldhausl for their invaluable assistance. This research
was supported by the Scientific Service Units of IST Austria through resources provided
by the MIBA Machine Shop and the nanofabrication facility, by the FWF-P 32235 project,
by the National Key R&D Program of China (2016YFA0301701, 2016YFA0300600), and by
the European Union’s Horizon 2020 research and innovation program under grant agreement
no. 862046. All data of this publication are available at 10.15479/AT:ISTA:7689."
article_processing_charge: Yes (via OA deal)
article_type: original
author:
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
- first_name: Josip
full_name: Kukucka, Josip
id: 3F5D8856-F248-11E8-B48F-1D18A9856A87
last_name: Kukucka
- first_name: Lada
full_name: Vukušić, Lada
id: 31E9F056-F248-11E8-B48F-1D18A9856A87
last_name: Vukušić
orcid: 0000-0003-2424-8636
- first_name: Hannes
full_name: Watzinger, Hannes
id: 35DF8E50-F248-11E8-B48F-1D18A9856A87
last_name: Watzinger
- first_name: Fei
full_name: Gao, Fei
last_name: Gao
- first_name: Ting
full_name: Wang, Ting
last_name: Wang
orcid: 0000-0002-4619-9575
- first_name: Jian-Jun
full_name: Zhang, Jian-Jun
last_name: Zhang
- first_name: Karsten
full_name: Held, Karsten
last_name: Held
citation:
ama: Katsaros G, Kukucka J, Vukušić L, et al. Zero field splitting of heavy-hole
states in quantum dots. Nano Letters. 2020;20(7):5201-5206. doi:10.1021/acs.nanolett.0c01466
apa: Katsaros, G., Kukucka, J., Vukušić, L., Watzinger, H., Gao, F., Wang, T., …
Held, K. (2020). Zero field splitting of heavy-hole states in quantum dots. Nano
Letters. American Chemical Society. https://doi.org/10.1021/acs.nanolett.0c01466
chicago: Katsaros, Georgios, Josip Kukucka, Lada Vukušić, Hannes Watzinger, Fei
Gao, Ting Wang, Jian-Jun Zhang, and Karsten Held. “Zero Field Splitting of Heavy-Hole
States in Quantum Dots.” Nano Letters. American Chemical Society, 2020.
https://doi.org/10.1021/acs.nanolett.0c01466.
ieee: G. Katsaros et al., “Zero field splitting of heavy-hole states in quantum
dots,” Nano Letters, vol. 20, no. 7. American Chemical Society, pp. 5201–5206,
2020.
ista: Katsaros G, Kukucka J, Vukušić L, Watzinger H, Gao F, Wang T, Zhang J-J, Held
K. 2020. Zero field splitting of heavy-hole states in quantum dots. Nano Letters.
20(7), 5201–5206.
mla: Katsaros, Georgios, et al. “Zero Field Splitting of Heavy-Hole States in Quantum
Dots.” Nano Letters, vol. 20, no. 7, American Chemical Society, 2020, pp.
5201–06, doi:10.1021/acs.nanolett.0c01466.
short: G. Katsaros, J. Kukucka, L. Vukušić, H. Watzinger, F. Gao, T. Wang, J.-J.
Zhang, K. Held, Nano Letters 20 (2020) 5201–5206.
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title: Zero field splitting of heavy-hole states in quantum dots
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