Short excitation pulses make the error photon spectrally broad, so a narrowband filter reduces the two-photon error rate by nearly an order of magnitude, down to g(2)(0) = 7.5 x 10^-5.
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Selective filtering of multi-photon events from a single-photon emitter
Short excitation pulses make the error photon spectrally broad, so a narrowband filter reduces the two-photon error rate by nearly an order of magnitude, down to g(2)(0) = 7.5 x 10^-5.