Quantum random walk with two controlled coherent photon is discussed. Two polarization entangled photons with completely coherence are generated by spontaneous parametric down-conversion (SPDC), and then a half wave plate (HWP) is used to perform Hadamard operation for controlling coherence between two photons through rotating the linear polarization direction of one photon. Quantum random walk with two photons from coherence to incoherence transition is explored. The effect of coherence between two photons on the quantum random walk is investigated through two photons controlled from coherence to incoherence transition.

中文翻译：

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两个光子之间的相干性对量子随机游动的影响

讨论了具有两个受控相干光子的量子随机游动。通过自发的参数下转换（SPDC）产生两个具有完全相干的偏振纠缠光子，然后使用半波片（HWP）进行哈达玛运算，通过旋转一个光子的线性偏振方向来控制两个光子之间的相干。探索了从相干到不相干跃迁的两个光子的量子随机游动。通过控制从相干到非相干转变的两个光子，研究了两个光子之间的相干对量子随机游动的影响。