Hojo Masayuki, Tanaka Koichiro
Opt Express. 2024 Jan 15;32(2):1902-1913. doi: 10.1364/OE.504654.
We demonstrate a technique that generates frequency-entangled photon pairs with strong polarization correlation by using a single-period nonlinear crystal and single pass configuration. The technique is based on the simultaneous occurrence of two spontaneous parametric down-conversion processes satisfying independent type-II collinear quasi-phase matching conditions in periodically poled stoichiometric lithium tantalate. The generated photon pairs exhibit non-degenerate Hong-Ou-Mandel interference, indicating the presence of quantum entanglement in the frequency domain. This method provides a light source capable of wide-range quantum sensing and quantum imaging or high-dimensional quantum processing.
我们展示了一种通过使用单周期非线性晶体和单程配置来产生具有强偏振相关性的频率纠缠光子对的技术。该技术基于在周期性极化化学计量比钽酸锂中同时发生的两个满足独立II型共线准相位匹配条件的自发参量下转换过程。所产生的光子对表现出非简并的Hong-Ou-Mandel干涉，表明在频域中存在量子纠缠。这种方法提供了一种能够用于宽范围量子传感、量子成像或高维量子处理的光源。
