Spontaneous Parametric Down-conversion(SPDC); correlated photon; quantum-efficiency; coincidence count;
自发参量下转换；相关光子； 量子效率；符合计数；
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.
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.
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。
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