--- _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 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. Physical Review A. 2023;107(3). doi:10.1103/PhysRevA.107.L031701 apa: Sokolova, A., Kalacheva, D. A., Fedorov, G. P., & Astafiev, O. V. (2023). Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.107.L031701 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.” Physical Review A. American Physical Society, 2023. https://doi.org/10.1103/PhysRevA.107.L031701. 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,” Physical Review A, 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.” Physical Review A, vol. 107, no. 3, L031701, American Physical Society, 2023, doi:10.1103/PhysRevA.107.L031701. 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' ...