We present an experimental investigation of two-photon interference using a continuous-wave laser. Using a Mach–Zehnder interferometer, we observe two-photon coalescence and its complementary effect, Hong–Ou–Mandel interference. We also demonstrate two-photon coalescence using a Michelson interferometer. Our work paves the way for the realization of multi-photon interference in high photon loss scenarios using continuous-wave lasers.

中文翻译：

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弱相干波包中的双光子结合观察

我们介绍了使用连续波激光器对两个光子干涉的实验研究。使用Mach–Zehnder干涉仪，我们观察到了两个光子的聚结及其互补效应，即Hong–Ou–Mandel干涉。我们还演示了使用迈克尔逊干涉仪的两光子结合。我们的工作为使用连续波激光器在高光子损耗情况下实现多光子干涉铺平了道路。