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Paper detail

Operating quantum waveguide circuits with superconducting single-photon detectors

Advanced quantum information science and technology (QIST) applications place exacting de- mands on optical components. Quantum waveguide circuits offer a route to scalable QIST on a chip. Superconducting single-photon detectors (SSPDs) provide infrared single-photon sensitivity combined with low dark counts and picosecond timing resolution. In this study we bring these two technologies together. Using SSPDs we observe a two-photon interference visibility of 92.3\pm1.0% in a silica-on-silicon waveguide directional coupler at \lamda = 804 nm-higher than that measured with silicon detectors (89.9\pm0.3%). We further operated controlled-NOT gate and quantum metrology circuits with SSPDs. These demonstrations present a clear path to telecom-wavelength quantum waveguide circuits.

preprint2010arXivOpen access
C. M. NatarajanA. PeruzzoS. MikiM. SasakiZ. WangB. BaekS. NamR. H. HadfieldJ. L. O'Brien
cond-mat.supr-conphysics.opticsquant-ph
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C. M. NatarajanA. PeruzzoS. MikiM. SasakiZ. WangB. BaekS. NamR. H. HadfieldJ. L. O'Brien

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