{"article_type":"letter_note","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.","quality_controlled":"1","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2209.05165"}],"citation":{"short":"A. Sokolova, D.A. Kalacheva, G.P. Fedorov, O.V. Astafiev, Physical Review A 107 (2023).","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>","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>.","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>","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."},"status":"public","intvolume":"       107","scopus_import":"1","issue":"3","publication_status":"published","date_created":"2023-04-09T22:01:00Z","year":"2023","oa_version":"Preprint","date_updated":"2023-08-01T14:06:05Z","article_number":"L031701","isi":1,"date_published":"2023-03-22T00:00:00Z","month":"03","oa":1,"volume":107,"language":[{"iso":"eng"}],"publication_identifier":{"eissn":["2469-9934"],"issn":["2469-9926"]},"publisher":"American Physical Society","type":"journal_article","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","external_id":{"isi":["000957799000006"],"arxiv":["2209.05165"]},"department":[{"_id":"JoFi"}],"article_processing_charge":"No","publication":"Physical Review A","title":"Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling","_id":"12819","author":[{"full_name":"Sokolova, Alesya","id":"2d0a0600-edfb-11eb-afb5-c0f5fa7f4f3a","last_name":"Sokolova","first_name":"Alesya","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.","last_name":"Astafiev","full_name":"Astafiev, O. V."}],"day":"22","abstract":[{"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.","lang":"eng"}],"doi":"10.1103/PhysRevA.107.L031701"}