Quantifying n-photon indistinguishability with a cyclic integrated interferometer

Fast and efficient demultiplexing of single photons from a quantum dot with resonantly enhanced electro-optic modulators

“…For example in Ref. 24, the TPI visibility decreased from 92% at 12 ns to 76% at 960 ns emission time separation. In addition, a high switching rate is also advantageous in multi-photon interference experiments with current single-photon detection technology that relies on APDs and superconducting nanowire single-photon detectors (SNSPDs).…”

“…Experimentally, active temporal-to-spatial demultiplexing was implemented in an integrated lithium niobate waveguide with four photons (with a fast switching rate of 40 MHz but low overall efficiency, due to waveguide-induced losses), 22 in low-loss free-space setups via broadband EOMs (slow switching at ≈ 1 MHz) and polarizing beamsplitters with four 23 and 20 photons 9 (of which 14 photons were detected), as well as with an acousto-optic modulator (slow switching at ≈ 1.4 MHz). 24 We use in this work resonantly enhanced EOMs that require much lower half-wave voltages compared to their broadband counterpart and allow for much faster switching rates. Therefore, our implementation sets itself apart from the previous ones by demonstrating high switching rates (switching of individual photons at 38 MHz) and high efficiency at the same time.…”