A quantum emitter in a waveguide sorts single- and two-photon light with 62% success, enabling Bell state measurements at 57% post-selected probability that exceeds the 50% linear-optics limit.
The factors of 1 2 come from the probability of a photon going to the short arm at the first pass, going to the short arm at the second pass, and then going to the right detector
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Photon Sorting with a Quantum Emitter
A quantum emitter in a waveguide sorts single- and two-photon light with 62% success, enabling Bell state measurements at 57% post-selected probability that exceeds the 50% linear-optics limit.