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Domain-engineered PPLN for entangled photon generation and other quantum information applications

机译:用于纠缠光子生成和其他量子信息应用的领域工程PPLN

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We describe the design and application of domain-engineered, periodically poled lithium niobate (PPLN) for use to produce entangled photons and for other tools in quantum information and communications. By specially designing and controlling the PPLN poling pattern, multiple nonlinear optical processes can be simultaneously phasematched. This capability can be used to generate polarization-entangled photon pairs through type-Ⅱ spontaneous parametric downconversion. The single PPLN crystal is designed to produce both the |HV> and |VH> states where the downconverted photons are distinguishable by wavelengths, which enables generation of post-selection-free, polarization-entangled twin photons. We describe the design and fabrication of the PPLN crystal, and initial experimental results for downconversion of a 775 nm pump to 1532 nm and 1567 nm orthogonally polarized photons. We also discuss other applications of engineered optical frequency conversion for quantum information including the use of dual-wavelength upconversion as a beamsplitter to route or analyze photons.
机译:我们描述了域工程,周期性极化的铌酸锂(PPLN)的设计和应用,该技术用于产生纠缠的光子以及量子信息和通信中的其他工具。通过专门设计和控制PPLN极化图案,可以同时对多个非线性光学过程进行相位匹配。该能力可用于通过Ⅱ型自发参数下转换产生偏振纠缠的光子对。单PPLN晶体被设计为产生| HV>和| VH>状态,其中下转换的光子可以通过波长区分,这使得能够生成无选择后,偏振纠缠的双光子。我们描述了PPLN晶体的设计和制造,以及将775 nm泵浦下转换为1532 nm和1567 nm正交偏振光子的初步实验结果。我们还讨论了用于量子信息的工程光学频率转换的其他应用,包括使用双波长上转换作为分束器来路由或分析光子。

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