东北师范大学张晓军团队近日实现了通过单原子腔辅助自发四波混频产生相关光子对。2025年5月7日出版的《物理评论A》杂志发表了这项成果。

课题组详细研究了在具有单个原子的双腔系统中，自发四波混频产生光子对的过程。腔模导致比通常假设的热真空更大的耦合强度，因此预计会有更高的产生率。与迄今为止出现的方法不同，研究组提出了一种基于主方程解的方法。 

这种方法使他们能够更严格地研究光子统计，且表明，泵浦失谐量和腔泄漏率的选择会显著影响自相关程度，并且可能会产生更高纯度的单光子源。研究组还推导出了极端情况下输出状态和产生率的简洁表达式，其中腔泄漏率远小于或大于自发辐射率。

附：英文原文

Title: Correlated photon-pair generation via single-atom cavity-assisted spontaneous four-wave mixing

Author: Yuan Feng (冯媛, Mao-Hua Wang (王茂桦, Jin-Hui Wu (吴金辉, Xiao-Jun Zhang (张晓军

Issue&Volume: 2025/05/07

Abstract: We present a detailed study of the generation of photon pairs by spontaneous four-wave mixing in a bicavity system with a single atom inside. Cavity modes lead to larger coupling strength than that of the normally assumed thermal vacuum, and thus higher generation rates are expected. Unlike approaches that have emerged so far, this paper presents an approach based on the solution of the master equation. This method allows us to investigate the photon statistics more strictly, and we show that the choices of pumping detuning and leaking rate of the cavities significantly affect the degree of the autocorrelation, and a higher-purity heralded single photon source is possible. We also derive a concise expression for the output state and the generation rate for the extreme cases where the cavity leaking rate is much smaller or larger than the rate of spontaneous emission.

DOI: 10.1103/PhysRevA.111.053705

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.053705