A scheme is theoretically proposed to generate nonreciprocal unconventional photon blockade (NUPB) via Barnett effect in a hybrid cavity magnonic system. In the hybrid cavity magnonic system, a spinning yttrium iron garnet (YIG) sphere is coupled to two microwave cavities. We consider one of the microwave cavities with χ(2) nonlinearity is pumped by a two-photon driving field, and the other one is driven by a weak probe field. For the spinning YIG sphere with a fixed angular speed, due to the different directions of the static magnetic field, the precession frequency of the magnon mode experiences the opposite Barnett frequency shifts, which leads to different quantum interference among two-photon excitation paths. This is also the essential reason for achieving NUPB. Moreover, switchable NUPB can be achieved by adjusting the relative phase between the two-photon driving field and the weak probe field. In addition, we demonstrate that the nonreciprocal photon statistical properties are robust to the dissipation rate and pure dephasing effect of photon mode a1. The present results illustrate the potential to achieve NUPB by utilizing the Barnett effect in a hybrid cavity magnonic system, as well as to guide the design of nonreciprocal single-photon devices.

中文翻译：

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在混合腔磁振子系统中通过 Barnett 效应进行非互易非常规光子阻挡


理论上提出了一种方案，通过巴内特效应在混合腔磁振子系统中产生非互易非常规光子封锁 （NUPB）。在混合腔磁振子系统中，一个旋转的钇铁石榴石 （YIG） 球体耦合到两个微波腔。我们认为具有 χ（2） 非线性度的微波腔之一由双光子驱动场泵浦，另一个由弱探针场驱动。对于具有固定角速度的旋转 YIG 球体，由于静磁场的方向不同，磁振子模式的进动频率会经历相反的 Barnett 频移，从而导致双光子激发路径之间产生不同的量子干涉。这也是实现 NUPB 的根本原因。此外，可以通过调整双光子驱动场和弱探针场之间的相对相位来实现可切换的 NUPB。此外，我们证明了非互易光子统计特性对光子模式 a1 的耗散速率和纯相效应是稳健的。目前的结果说明了通过在混合腔磁振子系统中利用 Barnett 效应来实现 NUPB 的潜力，以及指导非互易单光子器件的设计。