自发参量下转换；相关光子； 量子效率；符合计数；
Spontaneous Parametric Down-conversion(SPDC); correlated photon; quantum-efficiency; coincidence count;
推导自发参量下转换双光子态的数学表达式，并给出其几率解释。
Then state function of SPDC biphoton light field was derived and a probability explanation was given.
一类是通过光学参量下转换（PDC）的方式来获取光子对，从而得到有触发的单光子源。
One way is the parametric down conversion (PDC) and single-photons are generated either by the technique of heralding due to the simultaneity of the photon pairs.
相关的自发参量上转换和下转换光子表现出光束亮度高、空间发散小以及在很宽频谱范围内可调谐等特点。
The correlated spontaneous up conversion and down conversion photons exhibits a high beam brightness, small spatial divergence, and broad spectral tunability.
相关的自发参量上转换和下转换光子表现出光束亮度高、空间发散小以及在很宽频谱范围内可调谐等特点。
The correlated spontaneous up conversion and down conversion photons exhibits a high beam brightness, small spatial divergence, and broad spectral tunability.
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