---
_id: '14517'
abstract:
- lang: eng
text: 'State-of-the-art transmon qubits rely on large capacitors, which systematically
improve their coherence due to reduced surface-loss participation. However, this
approach increases both the footprint and the parasitic cross-coupling and is
ultimately limited by radiation losses—a potential roadblock for scaling up quantum
processors to millions of qubits. In this work we present transmon qubits with
sizes as low as 36 × 39 µm2 with 100-nm-wide vacuum-gap capacitors that are micromachined
from commercial silicon-on-insulator wafers and shadow evaporated with aluminum.
We achieve a vacuum participation ratio up to 99.6% in an in-plane design that
is compatible with standard coplanar circuits. Qubit relaxationtime measurements
for small gaps with high zero-point electric field variance of up to 22 V/m reveal
a double exponential decay indicating comparably strong qubit interaction with
long-lived two-level systems. The exceptionally high selectivity of up to 20 dB
to the superconductor-vacuum interface allows us to precisely back out the sub-single-photon
dielectric loss tangent of aluminum oxide previously exposed to ambient conditions.
In terms of future scaling potential, we achieve a ratio of qubit quality factor
to a footprint area equal to 20 µm−2, which is comparable with the highest T1
devices relying on larger geometries, a value that could improve substantially
for lower surface-loss superconductors. '
acknowledged_ssus:
- _id: NanoFab
acknowledgement: "This work was supported by the Austrian Science Fund (FWF) through
BeyondC (F7105), the European Research Council under Grant Agreement No. 758053
(ERC StG QUNNECT) and a NOMIS foundation research grant. M.Z. was the recipient
of a SAIA scholarship, E.R. of\r\na DOC fellowship of the Austrian Academy of Sciences,
and M.P. of a Pöttinger scholarship at IST Austria. S.B. acknowledges support from
Marie Skłodowska Curie Program No. 707438 (MSC-IF SUPEREOM). J.M.F. acknowledges
support from the Horizon Europe Program HORIZON-CL4-2022-QUANTUM-01-SGA via Project
No. 101113946 OpenSuperQPlus100 and the ISTA Nanofabrication Facility."
article_number: '044054'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Martin
full_name: Zemlicka, Martin
id: 2DCF8DE6-F248-11E8-B48F-1D18A9856A87
last_name: Zemlicka
- first_name: Elena
full_name: Redchenko, Elena
id: 2C21D6E8-F248-11E8-B48F-1D18A9856A87
last_name: Redchenko
- first_name: Matilda
full_name: Peruzzo, Matilda
id: 3F920B30-F248-11E8-B48F-1D18A9856A87
last_name: Peruzzo
orcid: 0000-0002-3415-4628
- first_name: Farid
full_name: Hassani, Farid
id: 2AED110C-F248-11E8-B48F-1D18A9856A87
last_name: Hassani
orcid: 0000-0001-6937-5773
- first_name: Andrea
full_name: Trioni, Andrea
id: 42F71B44-F248-11E8-B48F-1D18A9856A87
last_name: Trioni
- first_name: Shabir
full_name: Barzanjeh, Shabir
id: 2D25E1F6-F248-11E8-B48F-1D18A9856A87
last_name: Barzanjeh
orcid: 0000-0003-0415-1423
- first_name: Johannes M
full_name: Fink, Johannes M
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
citation:
ama: 'Zemlicka M, Redchenko E, Peruzzo M, et al. Compact vacuum-gap transmon qubits:
Selective and sensitive probes for superconductor surface losses. Physical
Review Applied. 2023;20(4). doi:10.1103/PhysRevApplied.20.044054'
apa: 'Zemlicka, M., Redchenko, E., Peruzzo, M., Hassani, F., Trioni, A., Barzanjeh,
S., & Fink, J. M. (2023). Compact vacuum-gap transmon qubits: Selective and
sensitive probes for superconductor surface losses. Physical Review Applied.
American Physical Society. https://doi.org/10.1103/PhysRevApplied.20.044054'
chicago: 'Zemlicka, Martin, Elena Redchenko, Matilda Peruzzo, Farid Hassani, Andrea
Trioni, Shabir Barzanjeh, and Johannes M Fink. “Compact Vacuum-Gap Transmon Qubits:
Selective and Sensitive Probes for Superconductor Surface Losses.” Physical
Review Applied. American Physical Society, 2023. https://doi.org/10.1103/PhysRevApplied.20.044054.'
ieee: 'M. Zemlicka et al., “Compact vacuum-gap transmon qubits: Selective
and sensitive probes for superconductor surface losses,” Physical Review Applied,
vol. 20, no. 4. American Physical Society, 2023.'
ista: 'Zemlicka M, Redchenko E, Peruzzo M, Hassani F, Trioni A, Barzanjeh S, Fink
JM. 2023. Compact vacuum-gap transmon qubits: Selective and sensitive probes for
superconductor surface losses. Physical Review Applied. 20(4), 044054.'
mla: 'Zemlicka, Martin, et al. “Compact Vacuum-Gap Transmon Qubits: Selective and
Sensitive Probes for Superconductor Surface Losses.” Physical Review Applied,
vol. 20, no. 4, 044054, American Physical Society, 2023, doi:10.1103/PhysRevApplied.20.044054.'
short: M. Zemlicka, E. Redchenko, M. Peruzzo, F. Hassani, A. Trioni, S. Barzanjeh,
J.M. Fink, Physical Review Applied 20 (2023).
date_created: 2023-11-12T23:00:55Z
date_published: 2023-10-20T00:00:00Z
date_updated: 2024-08-07T07:11:55Z
day: '20'
department:
- _id: JoFi
doi: 10.1103/PhysRevApplied.20.044054
ec_funded: 1
external_id:
arxiv:
- '2206.14104'
intvolume: ' 20'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2206.14104
month: '10'
oa: 1
oa_version: Preprint
project:
- _id: 26927A52-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: F07105
name: Integrating superconducting quantum circuits
- _id: 26336814-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '758053'
name: A Fiber Optic Transceiver for Superconducting Qubits
- _id: eb9b30ac-77a9-11ec-83b8-871f581d53d2
name: Protected states of quantum matter
- _id: 258047B6-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '707438'
name: 'Microwave-to-Optical Quantum Link: Quantum Teleportation and Quantum Illumination
with cavity Optomechanics SUPEREOM'
- _id: bdb7cfc1-d553-11ed-ba76-d2eaab167738
grant_number: '101080139'
name: Open Superconducting Quantum Computers (OpenSuperQPlus)
publication: Physical Review Applied
publication_identifier:
eissn:
- 2331-7019
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
record:
- id: '14520'
relation: research_data
status: public
scopus_import: '1'
status: public
title: 'Compact vacuum-gap transmon qubits: Selective and sensitive probes for superconductor
surface losses'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 20
year: '2023'
...
---
_id: '13264'
abstract:
- lang: eng
text: "We build a parametric amplifier with a Josephson field-effect transistor
(JoFET) as the active element. The resonant frequency of the device is field-effect
tunable over a range of 2 GHz. The JoFET amplifier has 20 dB of gain, 4 MHz of
instantaneous bandwidth, and a 1-dB compression point of -125.5 dBm when operated
at a fixed resonance frequency.\r\n\r\n"
acknowledged_ssus:
- _id: NanoFab
- _id: M-Shop
acknowledgement: We thank Shyam Shankar for helpful feedback on the manuscript. We
gratefully acknowledge the support of the ISTA nanofabrication facility, the Miba
Machine Shop, and the eMachine Shop. The NYU team acknowledges support from Army
Research Office Grant No. W911NF2110303.
article_number: '064032'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Duc T
full_name: Phan, Duc T
id: 29C8C0B4-F248-11E8-B48F-1D18A9856A87
last_name: Phan
- first_name: Paul
full_name: Falthansl-Scheinecker, Paul
id: 85b43b21-15b2-11ec-abd3-e2c252cc2285
last_name: Falthansl-Scheinecker
- first_name: Umang
full_name: Mishra, Umang
id: 4328fa4c-f128-11eb-9611-c107b0fe4d51
last_name: Mishra
- first_name: W. M.
full_name: Strickland, W. M.
last_name: Strickland
- first_name: D.
full_name: Langone, D.
last_name: Langone
- first_name: J.
full_name: Shabani, J.
last_name: Shabani
- first_name: Andrew P
full_name: Higginbotham, Andrew P
id: 4AD6785A-F248-11E8-B48F-1D18A9856A87
last_name: Higginbotham
orcid: 0000-0003-2607-2363
citation:
ama: Phan DT, Falthansl-Scheinecker P, Mishra U, et al. Gate-tunable superconductor-semiconductor
parametric amplifier. Physical Review Applied. 2023;19(6). doi:10.1103/PhysRevApplied.19.064032
apa: Phan, D. T., Falthansl-Scheinecker, P., Mishra, U., Strickland, W. M., Langone,
D., Shabani, J., & Higginbotham, A. P. (2023). Gate-tunable superconductor-semiconductor
parametric amplifier. Physical Review Applied. American Physical Society.
https://doi.org/10.1103/PhysRevApplied.19.064032
chicago: Phan, Duc T, Paul Falthansl-Scheinecker, Umang Mishra, W. M. Strickland,
D. Langone, J. Shabani, and Andrew P Higginbotham. “Gate-Tunable Superconductor-Semiconductor
Parametric Amplifier.” Physical Review Applied. American Physical Society,
2023. https://doi.org/10.1103/PhysRevApplied.19.064032.
ieee: D. T. Phan et al., “Gate-tunable superconductor-semiconductor parametric
amplifier,” Physical Review Applied, vol. 19, no. 6. American Physical
Society, 2023.
ista: Phan DT, Falthansl-Scheinecker P, Mishra U, Strickland WM, Langone D, Shabani
J, Higginbotham AP. 2023. Gate-tunable superconductor-semiconductor parametric
amplifier. Physical Review Applied. 19(6), 064032.
mla: Phan, Duc T., et al. “Gate-Tunable Superconductor-Semiconductor Parametric
Amplifier.” Physical Review Applied, vol. 19, no. 6, 064032, American Physical
Society, 2023, doi:10.1103/PhysRevApplied.19.064032.
short: D.T. Phan, P. Falthansl-Scheinecker, U. Mishra, W.M. Strickland, D. Langone,
J. Shabani, A.P. Higginbotham, Physical Review Applied 19 (2023).
date_created: 2023-07-23T22:01:12Z
date_published: 2023-06-09T00:00:00Z
date_updated: 2023-11-30T10:56:03Z
day: '09'
department:
- _id: AnHi
- _id: OnHo
doi: 10.1103/PhysRevApplied.19.064032
external_id:
arxiv:
- '2206.05746'
isi:
- '001012022600004'
intvolume: ' 19'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2206.05746
month: '06'
oa: 1
oa_version: Preprint
publication: Physical Review Applied
publication_identifier:
eissn:
- 2331-7019
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
record:
- id: '14547'
relation: dissertation_contains
status: public
scopus_import: '1'
status: public
title: Gate-tunable superconductor-semiconductor parametric amplifier
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 19
year: '2023'
...
---
_id: '10940'
abstract:
- lang: eng
text: 'Magnetic-field-resilient superconducting circuits enable sensing applications
and hybrid quantum computing architectures involving spin or topological qubits
and electromechanical elements, as well as studying flux noise and quasiparticle
loss. We investigate the effect of in-plane magnetic fields up to 1 T on the spectrum
and coherence times of thin-film three-dimensional aluminum transmons. Using a
copper cavity, unaffected by strong magnetic fields, we can probe solely the effect
of magnetic fields on the transmons. We present data on a single-junction and
a superconducting-quantum-interference-device (SQUID) transmon that are cooled
down in the same cavity. As expected, the transmon frequencies decrease with increasing
field, due to suppression of the superconducting gap and a geometric Fraunhofer-like
contribution. Nevertheless, the thin-film transmons show strong magnetic field
resilience: both transmons display microsecond coherence up to at least 0.65 T,
and T1 remains above 1μs over the entire measurable range. SQUID spectroscopy
is feasible up to 1 T, the limit of our magnet. We conclude that thin-film aluminum
Josephson junctions are suitable hardware for superconducting circuits in the
high-magnetic-field regime.'
acknowledgement: "We would like to thank Ida Milow for her internship in the laboratory
and contributions to our code base. We thank T. Zent and L. Hamdan for technical
assistance, and D. Fan for help with setting up the aluminum evaporator. We thank
A. Salari, M. Rößler, S. Barzanjeh, M. Zemlicka, F. Hassani, and M. Peruzzo for
contributions in the early stages of the experiments. This project has received
funding from the European Research Council (ERC) under the European Union’s Horizon
2020 research and innovation program (Grant Agreement No. 741121) and was also funded
by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under CRC
1238 – 277146847 (Subproject B01), as well as under Germany’s Excellence Strategy
– Cluster of Excellence Matter and Light for Quantum Computing (ML4Q), EXC 2004/1\r\n–
390534769."
article_number: '034032'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: J.
full_name: Krause, J.
last_name: Krause
- first_name: C.
full_name: Dickel, C.
last_name: Dickel
- first_name: E.
full_name: Vaal, E.
last_name: Vaal
- first_name: M.
full_name: Vielmetter, M.
last_name: Vielmetter
- first_name: J.
full_name: Feng, J.
last_name: Feng
- first_name: R.
full_name: Bounds, R.
last_name: Bounds
- first_name: G.
full_name: Catelani, G.
last_name: Catelani
- first_name: Johannes M
full_name: Fink, Johannes M
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
- first_name: Yoichi
full_name: Ando, Yoichi
last_name: Ando
citation:
ama: Krause J, Dickel C, Vaal E, et al. Magnetic field resilience of three-dimensional
transmons with thin-film Al/AlOx/Al Josephson junctions approaching 1 T. Physical
Review Applied. 2022;17(3). doi:10.1103/PhysRevApplied.17.034032
apa: Krause, J., Dickel, C., Vaal, E., Vielmetter, M., Feng, J., Bounds, R., … Ando,
Y. (2022). Magnetic field resilience of three-dimensional transmons with thin-film
Al/AlOx/Al Josephson junctions approaching 1 T. Physical Review Applied.
American Physical Society. https://doi.org/10.1103/PhysRevApplied.17.034032
chicago: Krause, J., C. Dickel, E. Vaal, M. Vielmetter, J. Feng, R. Bounds, G. Catelani,
Johannes M Fink, and Yoichi Ando. “Magnetic Field Resilience of Three-Dimensional
Transmons with Thin-Film Al/AlOx/Al Josephson Junctions Approaching 1 T.” Physical
Review Applied. American Physical Society, 2022. https://doi.org/10.1103/PhysRevApplied.17.034032.
ieee: J. Krause et al., “Magnetic field resilience of three-dimensional transmons
with thin-film Al/AlOx/Al Josephson junctions approaching 1 T,” Physical Review
Applied, vol. 17, no. 3. American Physical Society, 2022.
ista: Krause J, Dickel C, Vaal E, Vielmetter M, Feng J, Bounds R, Catelani G, Fink
JM, Ando Y. 2022. Magnetic field resilience of three-dimensional transmons with
thin-film Al/AlOx/Al Josephson junctions approaching 1 T. Physical Review Applied.
17(3), 034032.
mla: Krause, J., et al. “Magnetic Field Resilience of Three-Dimensional Transmons
with Thin-Film Al/AlOx/Al Josephson Junctions Approaching 1 T.” Physical Review
Applied, vol. 17, no. 3, 034032, American Physical Society, 2022, doi:10.1103/PhysRevApplied.17.034032.
short: J. Krause, C. Dickel, E. Vaal, M. Vielmetter, J. Feng, R. Bounds, G. Catelani,
J.M. Fink, Y. Ando, Physical Review Applied 17 (2022).
date_created: 2022-04-03T22:01:43Z
date_published: 2022-03-11T00:00:00Z
date_updated: 2023-08-03T06:23:58Z
day: '11'
department:
- _id: JoFi
doi: 10.1103/PhysRevApplied.17.034032
external_id:
arxiv:
- '2111.01115'
isi:
- '000770371400003'
intvolume: ' 17'
isi: 1
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2111.01115
month: '03'
oa: 1
oa_version: Preprint
publication: Physical Review Applied
publication_identifier:
eissn:
- 2331-7019
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Magnetic field resilience of three-dimensional transmons with thin-film Al/AlOx/Al
Josephson junctions approaching 1 T
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 17
year: '2022'
...