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We demonstrate a multiplexing scheme for upconversion-based single-photon detection using a waveguide with multiple phase-matching peaks. Two different signal wavelengths are upconverted using two distinct pump wavelengths, where all the wavelengths are in the 1550-nm band. Background photon generation rates $<10^{-4}$ per pulse with high internal conversion efficiencies are observed using 20-ps-long...
Quantum Zeno blockade offers a distinct approach to signal manipulation and logic operations in a counterintuitive “interaction-free” implementation. Previous experimental studies have used nonlinear waveguides and optical cavities, both in bulk-optics settings. We report the observation of quantum Zeno blockade in a chip-integrable platform, whose results point to all-optical information processing...
We show that spatiotemporally overlapping quantum photonic signals in orthogonal time-frequency modes can be discriminated via quantum frequency conversion during a single passage through a waveguide.
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