I understand that a quantum dot can emit a single photon with relatively high efficiency,
it occurs non-‐deterministically i.e. only a fraction of the pulses effectively generates
a photon. This problem can be intensified if we consider that due to losses, a photon
emitted in the quantum dot can be absorbed before being multiplexed to its final output
mode. So what I don't understand is that what is meant by photon multiplexing in a layman's language?
Note that in the non-degenerate spontanous parametric down-conversion in non-linear crystals you can create two-mode squeeze state of light which has a certain probability to have 1-1, 2-2, 3-3 photons etc. Ideally, if you detect 3 photons in one mode it heralds 3 photons in the other. In practice people typically stay in the regime with 1-1 photons. In principle, with the use of photon number resolving detectors based on avalanche photo diodes you could herald higher number of photons. But I guess that their finite QE would severely limit the heralding usability...
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