论文标题
在1550 nm处由定期螺旋的mtioxo4产生的1550 nm（m = k，rb，cs; x = p，AS）的频谱不相关的两光子。
Counter-propagating spectrally uncorrelated biphotons at 1550 nm generated from periodically poled MTiOXO4 (M = K, Rb, Cs; X = P, As)
论文作者
论文摘要
我们从理论上研究了来自定期螺旋的mtioxo4（m = k，rb，cs; x = p，as）晶体中晶体中的反传播自发参数下调（CP-SPDC）中产生的频谱不相关的两光子。通过数值计算，发现来自KTP家族的五个晶体可用于生成具有较高光谱纯度和宽可调性的预言单光子。在0型相匹配条件下，1550 nm的纯度在0.91至0.92之间，纯度可以维持在1500 nm到2000 nm波长的0.90以上。在II型相匹配条件下，PPKTP，PPRTP，PPKTA，PPRTA和PPCTA的1550 nm的纯度分别为0.96、0.97、0.97、0.98和0.98；此外，对于超过600 nm的波长范围，纯度可以保持在0.96以上。我们还模拟了PPRTP晶体在1550 nm处的独立光子源之间的Hong-Ou-mandel干扰，在Type-0（类型-II）相匹配条件下，干扰可见性为92％（97％）。这项研究可能会为电信波长处的量子记忆和量子网络提供光谱纯窄带单光子源。
We theoretically investigated spectrally uncorrelated biphotons generated in a counter-propagating spontaneous parametric downconversion (CP-SPDC) from periodically poled MTiOXO4 (M = K, Rb, Cs; X = P, As) crystals. By numerical calculation, it was found that the five crystals from the KTP family can be used to generate heralded single photons with high spectral purity and wide tunability. Under the type-0 phase-matching condition, the purity at 1550 nm was between 0.91 and 0.92, and the purity can be maintained over 0.90 from 1500 nm to 2000 nm wavelength. Under the type-II phase-matching condition, the purity at 1550 nm was 0.96, 0.97, 0.97, 0.98, and 0.98 for PPKTP, PPRTP, PPKTA, PPRTA, and PPCTA, respectively; furthermore, the purity can be kept over 0.96 for more than 600 nm wavelength range. We also simulated the Hong-Ou-Mandel interference between independent photon sources for PPRTP crystals at 1550 nm, and interference visibility was 92% (97%) under type-0 (type-II) phase-matching condition. This study may provide spectrally pure narrowband single-photon sources for quantum memories and quantum networks at telecom wavelengths.
