电信波长连续波非简并光子对中的光谱相关性与干涉
Spectral correlation and interference in continuous-wave non-degenerate photon pairs at telecom wavelengths.
作者信息
Kuo Paulina S, Gerrits Thomas, Verma Varun, Nam Sae Woo
机构信息
Information Technology Laboratory, National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, USA 20899-8913.
Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), 325 Broadway, Boulder, CO, USA 80305-3337.
出版信息
Proc SPIE Int Soc Opt Eng. 2017;1.011817E6. doi: 10.1117/12.2263389.
We have developed an entangled photon pair source based on a domain-engineered, type-II periodically poled lithium niobate crystal that produces signal and idler photons at 1533 nm and 1567 nm. We characterized the spectral correlations of the generated entangled photons using fiber-assisted signal-photon spectroscopy. We observed interference between the two down-conversion paths after erasing polarization distinguishability of the down-converted photons. The observed interference signature is closely related to the spectral correlations between photons in a Hong- Ou-Mandel interferometer. These measurements suggest good indistinguishability between the two downconversion paths, which is required for high entanglement visibility.
我们基于一种经过畴工程处理的II型周期性极化铌酸锂晶体开发了一种纠缠光子对源，该晶体可产生波长为1533纳米和1567纳米的信号光子和闲置光子。我们使用光纤辅助信号光子光谱对产生的纠缠光子的光谱相关性进行了表征。在消除下转换光子的偏振可区分性之后，我们观察到了两条下转换路径之间的干涉。观察到的干涉特征与Hong-Ou-Mandel干涉仪中光子之间的光谱相关性密切相关。这些测量结果表明两条下转换路径之间具有良好的不可区分性，这是实现高纠缠可见度所必需的。
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