超宽带、光束状参量下转换的观测
Observation of ultra-broadband, beamlike parametric downconversion
摘要：
我们报告自发参量下转换具有异常宽的光谱带宽。共线1型相位匹配配置与简并附近的零群速度色散频率。该光源的光谱宽度为1080 nm，简并波长为1885 nm，它还发射出高通量的光子对，这些光子对被限制在仅为2度半角的锥体内。一个严格的理论方法，证实了实验观察。源的属性是一致的超短光子对相关时间，并为窄带泵，非常高维的光谱纠缠。
英文摘要：
We report spontaneous parametric downconversion having an unusually wide spectral bandwidth. A collinear type-1 phase-matching configuration is employed with degeneracy near the zero group velocity dispersion frequency. With a spectral width of 1080 nm and degenerate wavelength 1885 nm, the source also emits a high flux of photon pairs constrained to a cone of only 2 degree half-angle. A rigorous theoretical approach is developed that confirms the experimental observations. The source properties are consistent with an ultra-short photon-pair correlation time and, for a narrowband pump, extremely high-dimensional spectral entanglement.
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