---
_id: '12819'
abstract:
- lang: eng
  text: 'Reaching a high cavity population with a coherent pump in the strong-coupling
    regime of a single-atom laser is impossible due to the photon blockade effect.
    In this Letter, we experimentally demonstrate that in a single-atom maser based
    on a transmon strongly coupled to two resonators, it is possible to pump over
    a dozen photons into the system. The first high-quality resonator plays the role
    of a usual lasing cavity, and the second one presents a controlled dissipation
    channel, bolstering population inversion, and modifies the energy-level structure
    to lift the blockade. As confirmation of the lasing action, we observe conventional
    laser features such as a narrowing of the emission linewidth and external signal
    amplification. Additionally, we report unique single-atom features: self-quenching
    and several lasing thresholds.'
acknowledgement: We thank N.N. Abramov for assistance with the experimental setup.
  The sample was fabricated using equipment of MIPT Shared Facilities Center. This
  research was supported by Russian Science Foundation, grant no. 21-72-30026.
article_number: L031701
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Alesya
  full_name: Sokolova, Alesya
  id: 2d0a0600-edfb-11eb-afb5-c0f5fa7f4f3a
  last_name: Sokolova
  orcid: 0000-0002-8308-4144
- first_name: D. A.
  full_name: Kalacheva, D. A.
  last_name: Kalacheva
- first_name: G. P.
  full_name: Fedorov, G. P.
  last_name: Fedorov
- first_name: O. V.
  full_name: Astafiev, O. V.
  last_name: Astafiev
citation:
  ama: Sokolova A, Kalacheva DA, Fedorov GP, Astafiev OV. Overcoming photon blockade
    in a circuit-QED single-atom maser with engineered metastability and strong coupling.
    <i>Physical Review A</i>. 2023;107(3). doi:<a href="https://doi.org/10.1103/PhysRevA.107.L031701">10.1103/PhysRevA.107.L031701</a>
  apa: Sokolova, A., Kalacheva, D. A., Fedorov, G. P., &#38; Astafiev, O. V. (2023).
    Overcoming photon blockade in a circuit-QED single-atom maser with engineered
    metastability and strong coupling. <i>Physical Review A</i>. American Physical
    Society. <a href="https://doi.org/10.1103/PhysRevA.107.L031701">https://doi.org/10.1103/PhysRevA.107.L031701</a>
  chicago: Sokolova, Alesya, D. A. Kalacheva, G. P. Fedorov, and O. V. Astafiev. “Overcoming
    Photon Blockade in a Circuit-QED Single-Atom Maser with Engineered Metastability
    and Strong Coupling.” <i>Physical Review A</i>. American Physical Society, 2023.
    <a href="https://doi.org/10.1103/PhysRevA.107.L031701">https://doi.org/10.1103/PhysRevA.107.L031701</a>.
  ieee: A. Sokolova, D. A. Kalacheva, G. P. Fedorov, and O. V. Astafiev, “Overcoming
    photon blockade in a circuit-QED single-atom maser with engineered metastability
    and strong coupling,” <i>Physical Review A</i>, vol. 107, no. 3. American Physical
    Society, 2023.
  ista: Sokolova A, Kalacheva DA, Fedorov GP, Astafiev OV. 2023. Overcoming photon
    blockade in a circuit-QED single-atom maser with engineered metastability and
    strong coupling. Physical Review A. 107(3), L031701.
  mla: Sokolova, Alesya, et al. “Overcoming Photon Blockade in a Circuit-QED Single-Atom
    Maser with Engineered Metastability and Strong Coupling.” <i>Physical Review A</i>,
    vol. 107, no. 3, L031701, American Physical Society, 2023, doi:<a href="https://doi.org/10.1103/PhysRevA.107.L031701">10.1103/PhysRevA.107.L031701</a>.
  short: A. Sokolova, D.A. Kalacheva, G.P. Fedorov, O.V. Astafiev, Physical Review
    A 107 (2023).
date_created: 2023-04-09T22:01:00Z
date_published: 2023-03-22T00:00:00Z
date_updated: 2023-08-01T14:06:05Z
day: '22'
department:
- _id: JoFi
doi: 10.1103/PhysRevA.107.L031701
external_id:
  arxiv:
  - '2209.05165'
  isi:
  - '000957799000006'
intvolume: '       107'
isi: 1
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.48550/arXiv.2209.05165
month: '03'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Overcoming photon blockade in a circuit-QED single-atom maser with engineered
  metastability and strong coupling
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...