Induced photon correlations are directly demonstrated by exploring two coupled nonlinear processes in an integrated device. Using orthogonally polarized modes within an integrated microring cavity, phase matching of two different nonlinear four‐wave mixing processes is achieved simultaneously, wherein both processes share one target frequency mode, while their other frequency modes differ. The overlap of these modes leads to the coupling of both nonlinear processes, producing photon correlations. The nature of this process is confirmed by means of time‐ and power‐dependent photon correlation measurements. These findings are relevant to the fundamental understanding of spontaneous parametric effects as well as single‐photon‐induced processes, and their effect on optical quantum state generation and control.

中文翻译：

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集成腔中两个四波混合过程的重叠引起的光子相关性

通过探索集成设备中的两个耦合的非线性过程，可以直接证明诱发的光子相关性。使用集成微环腔内的正交极化模式，可以同时实现两个不同的非线性四波混频过程的相位匹配，其中两个过程共享一个目标频率模式，而其他频率模式不同。这些模式的重叠导致两个非线性过程的耦合，产生光子相关性。该过程的性质通过依赖于时间和功率的光子相关性测量来确认。这些发现与对自发参量效应以及单光子诱导过程及其对光量子态产生和控制的影响的基本理解有关。