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Operating quantum waveguide circuits with superconducting single-photon detectors
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Quantum waveguide circuits characterized with SSPDs at . (a) CNOT truth table. (b) Voltage-tuned two-photon interference in a waveguide Mach–Zehnder interferometer.


Generic image for table
Table I.

Comparison of the properties of SSPD and Si SPAD (Ref. 27) detectors at .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Operating quantum waveguide circuits with superconducting single-photon detectors