Opt Lett. 2018 Jun 15;43(12):2760-2763. doi: 10.1364/OL.43.002760.
The Hong-Ou-Mandel (HOM) interference is one of the most fundamental quantum-mechanical effects that reveal a nonclassical behavior of single photons. Two identical photons that are incident on the input ports of an unbiased beam splitter always exit the beam splitter together from the same output port, an effect referred to as photon bunching. In this Letter, we utilize a single electro-optic phase modulator as a probabilistic frequency beam splitter, which we exploit to observe HOM interference between two photons that are in different spectral modes, yet are identical in other characteristics. Our approach enables linear optical quantum information processing protocols using the frequency degree of freedom in photons such as quantum computing techniques with linear optics.
Hong-Ou-Mandel（HOM）干涉是最基本的量子力学效应之一，揭示了单光子的非经典行为。两个相同的光子入射到非偏分束器的输入端口时，总是从同一输出端口一起出射，这种效应称为光子聚束。在这封信中，我们利用单个电光相位调制器作为概率频率分束器，观察到两个处于不同光谱模式但在其他特性上相同的光子之间的 HOM 干涉。我们的方法可以使用光子的频率自由度来实现线性光学量子信息处理协议，例如使用线性光学的量子计算技术。
