标题： 在电信波长下生成退化、可因式分解的脉冲压缩光 显示英文标题

标题： Generation of degenerate, factorizable, pulsed squeezed light at telecom wavelengths

摘要： 我们表征了一种周期极化KTP晶体，该晶体产生具有正交偏振的纠缠、双模压缩态，几乎相同、可分离的频率模式，以及在不需要的频率模式中光子数很少。 我们将泵浦光束聚焦，以在两个模式之间产生几乎圆形的联合频谱概率分布。 在解缠两个模式后，当应用8.6 nm带宽的光谱滤波器时，我们观察到Hong-Ou-Mandel干涉，原始（背景校正后）可见度为86 %（95 %）。 我们使用超导纳米线单光子探测器和光子数分辨过渡边缘传感器测量了纠缠和解缠的压缩态的二阶光子相关性。 两种方法结果一致，并验证了检测到的模式包含所需的光子数分布。 显示英文摘要

摘要： We characterize a periodically poled KTP crystal that produces an entangled, two-mode, squeezed state with orthogonal polarizations, nearly identical, factorizable frequency modes, and few photons in unwanted frequency modes. We focus the pump beam to create a nearly circular joint spectral probability distribution between the two modes. After disentangling the two modes, we observe Hong-Ou-Mandel interference with a raw (background corrected) visibility of 86 % (95 %) when an 8.6 nm bandwidth spectral filter is applied. We measure second order photon correlations of the entangled and disentangled squeezed states with both superconducting nanowire single-photon detectors and photon-number-resolving transition-edge sensors. Both methods agree and verify that the detected modes contain the desired photon number distributions.