We propose a scheme to realize nonreciprocal photon blockade and directional amplification in a spinning resonator with clockwise and counterclockwise traveling modes coupled to a stationary two-level atom. By manipulating the rotational frequency of the resonator, the two-level atom can be resonant with one of the traveling modes and largely detuned from the other one. Nonreciprocal conventional photon blockade is induced by the difference of the detunings between the two-level atom and the optical modes traveling in different directions. Besides that, nonreciprocal unconventional photon blockade (UPB) based on the quantum interference can also be observed in the system. Based on the mechanism for nonreciprocal UPB, directional amplification of the blockaded photons is predicted by driving the spinning resonator and stationary two-level atom simultaneously. Our proposal will be applicable to achieve highly efficient nonreciprocal single-photon devices for applications in chiral quantum information processing.

中文翻译：

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耦合到两能级原子的自旋谐振器中的非互易光子阻断和定向放大

我们提出了一种在旋转谐振器中实现非互易光子阻塞和定向放大的方案，该谐振器具有与固定两能级原子耦合的顺时针和逆时针行进模式。通过操纵谐振器的旋转频率，两能级原子可以与一种行进模式共振，并在很大程度上与另一种模式失谐。非互易的常规光子阻塞是由两能级原子和沿不同方向传播的光学模式之间的失谐差异引起的。除此之外，在系统中还可以观察到基于量子干涉的非互易非常规光子阻断（UPB）。基于非互惠UPB的机制，通过同时驱动自旋谐振器和静止的两能级原子来预测受阻光子的定向放大。我们的提议将适用于实现用于手性量子信息处理的高效非互易单光子器件。