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SSPD system detection efficiency vs ungated dark count rate measured with calibrated attenuated laser diodes at wavelengths of 830, 1310, and 1550 nm. The detector operating temperature is 3 K.
Experimental setup for the two-photon interference experiment. Photon pairs at are generated by spontaneous parametric down-conversion of 402 nm cw light in a type-I nonlinear (BiBO) crystal. Photon pairs collected and coupled to the 50:50 coupler waveguide through a PMF. The outputs of the waveguide circuit are routed to a pair of single-photon detectors (SSPDs or Si SPADs) via single mode optical fiber. Coincidences between the detector channels are recorded using a time-correlated single-photon counting card.
Two-photon interference in a quantum waveguide circuit at . HOM dip obtained using (a) SSPDs and (b) Si SPADs. The acquisition time per data point was 60 s for the SSPDs and 40 s for the Si SPADs. Poissionian error bars of are shown.
Quantum waveguide circuits characterized with SSPDs at . (a) CNOT truth table. (b) Voltage-tuned two-photon interference in a waveguide Mach–Zehnder interferometer.
Comparison of the properties of SSPD and Si SPAD (Ref. 27) detectors at .
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