We report a highly efficient source of narrow-band photon pairs based on parametric down-conversion in a crystalline-whispering-gallery-mode resonator. Remarkably, each photon of a pair is detected in a single spatial and temporal mode, as witnessed by Glauber's autocorrelation function. We explore the phase-matching conditions in spherical geometries, and determine the requirements for single-mode operation. Understanding these conditions has allowed us to experimentally demonstrate a single-mode pair-detection efficiency of 1.13 x 10(6) pairs/s per mW pump power per 26.8 MHz bandwidth.
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机译：我们报告了晶体耳语画廊模式共振器中基于参数下转换的窄带光子对的高效来源。值得注意的是，正如格劳伯的自相关函数所证明的那样，一对光子是在单个时空模式下检测到的。我们探索球形几何形状中的相位匹配条件，并确定单模运行的要求。了解这些条件使我们能够通过实验证明每26.8 MHz带宽每mW泵浦功率1.13 x 10（6）对/ s的单模对检测效率。
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