Chen Chenyuan, Ye Bilin, Zhang Huangjie, Zhou YongGang, Jin SangZhong, Hao Ran
Appl Opt. 2024 Apr 20;63(12):3237-3241. doi: 10.1364/AO.520654.
Polarization control is a major issue in topological quantum optics that limits reliable generation and transmission of quantum states. This study presents what we believe to be a novel topological photonic crystal design that provides topological protection for biphoton pairs for both TE and TM polarization. By well-designed cell configurations within the lattice, two topological boundaries emerge that can accommodate TM and TE modes at the same time. By adjusting the dispersion curves, we can further design nonlinear four-wave mixing processes within the topological photonic crystals and provide theoretical explanations for the entanglement of the dual-polarization biphoton states. Numerical results confirm the robust transport of entangled photon pairs, even when subjected to sharp bending. Moreover, combining the dual-polarization topological photonic crystal with a polarization beam splitter enables the preparation of polarization-encoded maximally entangled states. Our work exhibits significant potential for applications in robust optical quantum information processing and quantum secure communication.
偏振控制是拓扑量子光学中的一个主要问题，它限制了量子态的可靠产生和传输。本研究提出了一种我们认为新颖的拓扑光子晶体设计，该设计为TE和TM偏振的双光子对提供拓扑保护。通过晶格内精心设计的单元配置，出现了两个拓扑边界，它们可以同时容纳TM和TE模式。通过调整色散曲线，我们可以进一步设计拓扑光子晶体内的非线性四波混频过程，并为双偏振双光子态的纠缠提供理论解释。数值结果证实了纠缠光子对的稳健传输，即使在受到急剧弯曲时也是如此。此外，将双偏振拓扑光子晶体与偏振分束器相结合，能够制备偏振编码的最大纠缠态。我们的工作在稳健的光学量子信息处理和量子安全通信应用中展现出巨大潜力。
