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.
We shall use an indexi from 1 to 4, which is assigned to each state as it was pre- sented in the previous line
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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.