基于相位调制周期极化铌酸锂的偏振纠缠光子对源的演示。
Demonstration of a polarization-entangled photon-pair source based on phase-modulated PPLN.
作者信息
Kuo Paulina S, Verma Varun B, Nam Sae Woo
机构信息
Information Technology Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA.
Physical Measurement Laboratory, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
出版信息
OSA Contin. 2020;3(2). doi: https://doi.org/10.1364/osac.387449.
We develop and demonstrate a source of polarization-entangled photon pairs using spontaneous parametric down-conversion (SPDC) in domain-engineered, periodically poled lithium niobate (PPLN) at telecom wavelengths. Pumped at 775 nm, this domain-engineered type-II SPDC source produces non-degenerate signal and idler pairs at 1530 nm and 1569 nm. Because of birefringence, the photon pair with horizontally polarized signal and vertically polarized idler has a different phasematching condition than the pair with vertically polarized signal and horizontally polarized idler. Using phase-modulation of the domain structure, we produced a crystal that can simultaneously generate both states in a distributed fashion throughout a single crystal. Performing SPDC using this aperiodically poled crystal, we observed polarization entanglement visibility above 93%. We compare the phase-modulated crystal to other aperiodic structures, including dual-periodically-poled and interlaced biperiodic structures.
我们利用电信波长下在畴工程化的周期性极化铌酸锂（PPLN）中进行的自发参量下转换（SPDC），开发并展示了一种偏振纠缠光子对源。在775 nm波长下泵浦时，这种畴工程化的II型SPDC源会在1530 nm和1569 nm处产生非简并信号光和闲频光对。由于双折射，水平偏振信号光和垂直偏振闲频光的光子对与垂直偏振信号光和水平偏振闲频光的光子对具有不同的相位匹配条件。通过对畴结构进行相位调制，我们制备出了一种能够在整个单晶中以分布式方式同时产生这两种状态的晶体。使用这种非周期性极化晶体进行SPDC，我们观察到偏振纠缠可见度超过93%。我们将相位调制晶体与其他非周期性结构进行了比较，包括双周期极化和交错双周期结构。
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