Wang Dong-Yang, Yan Lei-Lei, Su Shi-Lei, Bai Cheng-Hua, Wang Hong-Fu, Liang Erjun
Opt Express. 2023 Jul 3;31(14):22343-22357. doi: 10.1364/OE.493208.
We propose a scheme to generate nonreciprocal photon blockade in a stationary whispering gallery microresonator system based on two physical mechanisms. One of the two mechanisms is inspired by recent work [Phys. Rev. Lett.128, 083604 (2022)10.1103/PhysRevLett.128.083604], where the quantum squeezing caused by parametric interaction not only shifts the optical frequency of propagating mode but also enhances its optomechanical coupling, resulting in a nonreciprocal conventional photon blockade phenomenon. On the other hand, we also give another mechanism to generate stronger nonreciprocity of photon correlation according to the destructive quantum interference. Comparing these two strategies, the required nonlinear strength of parametric interaction in the second one is smaller, and the broadband squeezed vacuum field used to eliminate thermalization noise is no longer needed. All analyses and optimal parameter relations are further verified by numerically simulating the quantum master equation. Our proposed scheme opens a new avenue for achieving the nonreciprocal single photon source without stringent requirements, which may have critical applications in quantum communication, quantum information processing, and topological photonics.
我们提出了一种基于两种物理机制在静态回音壁微谐振器系统中产生非互易光子阻塞的方案。这两种机制中的一种受到近期工作[《物理评论快报》128, 083604 (2022)10.1103/PhysRevLett.128.083604]的启发，其中参数相互作用引起的量子压缩不仅会使传播模式的光学频率发生偏移，还会增强其光机械耦合，从而导致非互易的传统光子阻塞现象。另一方面，我们还根据相消量子干涉给出了另一种产生更强光子相关性非互易性的机制。比较这两种策略，第二种策略中参数相互作用所需的非线性强度较小，并且不再需要用于消除热化噪声的宽带压缩真空场。通过对量子主方程进行数值模拟，进一步验证了所有分析和最优参数关系。我们提出的方案为实现无需严格要求的非互易单光子源开辟了一条新途径，这可能在量子通信、量子信息处理和拓扑光子学中具有关键应用。
