  The reliable, deterministic production of trustworthy high-quality single
photons is a critical component of discrete variable, optical quantum
technology. For single-photon based fully error-corrected quantum computing
systems, it is estimated that photon sources will be required to produce a
reliable stream of photons at rates exceeding 1 GHz [1]. Photon multiplexing,
where low probability sources are combined with switching networks to route
successful production events to an output, are a potential solution but
requires extremely fast single photon switching with ultra-low loss rates. In
this paper we examine the specific properties of the switching elements and
present a new design that exploits the general one-way properties of common
switching elements such as thermal pads. By introducing multiple switches to a
basic, temporal multiplexing device, we are able to use slow switching elements
in a multiplexed source being pumped at much faster rates. We model this design
under multiple error channels and show that anticipated performance is now
limited by the intrinsic loss rate of the optical waveguides within integrated
photonic chipsets.
