近日，长春理工大学的杨慧及其研究团队取得一项新进展。经过不懈努力，他们通过量子干涉在三波混合中实现光子对阻塞效应的显著增强。相关研究成果已于2024年11月5日在国际知名学术期刊《物理评论A》上发表。

本文研究了具有克尔非线性的三波混合系统中的光子对阻塞效应。通过解析计算和数值分析，研究人员发现在此系统的强耦合状态下，可以同时实现光子对的常规阻塞和非常规阻塞，且两者的结合能显著增强光子对阻塞效应。

这种结合还使得该混合系统中的光子对阻塞效应远强于普通的三波混合系统，有助于构建纯度更高且亮度不损失的单光子对源。

此外，该方案还能实现同频和异频光子对的阻塞，为构建同频或异频光子对源或器件提供了可能。所有这些结果均可为未来实验和应用中，设计相关光子对源或器件提供有用的理论参考。

附：英文原文

Title: Strongly enhanced photon-pair blockade with three-wave mixing by quantum interference

Author: Xianfu Qiao, Zhihai Yao, Hui Yang

Issue&Volume: 2024/11/05

Abstract: In this paper, the photon-pair blockade effect in a three-wave mixing system with Kerr nonlinearity has been studied. By analytical calculation and numerical analysis, we find that the conventional photon blockade and unconventional photon blockade of the photon pair could be realized simultaneously in the strong-coupling regime in this system, and the photon-pair blockade effect could be enhanced strongly by the combination of them. The combination could also lead to a much stronger photon-pair blockade effect in this hybrid system than in a three-wave mixing system, which may contribute to construction of single photon-pair sources with much higher purity without the loss of brightness. In addition, both the same-frequency and different-frequency photon-pair blockades could be realized in this scheme, which may contribute to construction of the same-frequency or different-frequency photon-pair sources or devices. All the results may provide useful theoretical references for the design of correlated photon-pair sources or devices in future experiments and applications.

DOI: 10.1103/PhysRevA.110.053702

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.053702