Generation of indistinguishable single photons on demand is a fundamental challenge in quantum optics and a key requirement for scalable photonic quantum computing and communication. Single photons can be obtained from photon pairs generated by spontaneous parametric down conversion (SPDC) or spontaneous four-wave mixing (SFWM). Detecting one photon in a pair heralds the existance of the other. This allows heralded single-photon sources to be deterministically combined using either spatial [1] or temporal [2] active multiplexing. Efficient multiplexing increases the probability of having a single photon at the output, per pump clock, for a given coincidence to accidental ratio (CAR). In this paper, we present a 100% enhancement to the heralded single-photon rate by active temporal multiplexing of a silicon nanowire-based heralded single-photon source. This advance is enabled by our fast field-programmable gate array technology, and the low-loss, fast optical ceramic switches [3].

© 2015 IEEE

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