@article{12819,
  abstract     = {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.},
  author       = {Sokolova, Alesya and Kalacheva, D. A. and Fedorov, G. P. and Astafiev, O. V.},
  issn         = {2469-9934},
  journal      = {Physical Review A},
  number       = {3},
  publisher    = {American Physical Society},
  title        = {{Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling}},
  doi          = {10.1103/PhysRevA.107.L031701},
  volume       = {107},
  year         = {2023},
}