论文标题
在电路QED单原子MASER中克服具有工程标准和强耦合的光子封锁
Overcoming photon blockade in circuit QED single-atom maser with engineered metastability and strong coupling
论文作者
论文摘要
由于光子阻断效应，无法在单原子激光的强耦合方面达到高腔种群，并具有连贯的泵。在这项工作中，我们在实验上证明，在基于三个谐振器与两个谐振器的单元maser中，可以将十几个光子泵入系统。第一个高质量的谐振器在通常的激光腔中扮演着角色，第二个谐振器呈现了受控的耗散通道，增强了种群反演，并修改了能量水平结构以提高封锁。为了确认激光作用，我们观察到传统的激光特征，例如发射线宽的缩小和外部信号扩增。此外，我们报告了独特的单原子特征：自我Quenching和几个激光阈值。
Reaching 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 work, 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 of photons into the system. The first high-quality resonator plays a role of 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 a confirmation of lasing action, we observe conventional laser features such as the narrowing of emission linewidth and external signal amplification. Additionally, we report unique single-atom features: self-quenching and several lasing thresholds.
