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Bright sources of on-demand single photons are a fundamental resource [1], required for linear optical quantum computing and quantum communication. Heralded single photon sources are based on photon-pair generation in nonlinear optical media, such as χ(2) crystals and χ(3) waveguides [2,3], where one photon in the pair is detected to herald the existance of the remaining photon. The number of photon...
We experimentally demonstrate a 10 times enhancement to the coincidence-to-accidental ratio of a correlated photon-pair source from a chalcogenide Ge11.5As24Se64.5 nanowire. This improvement is enabled by the low-Raman window of the device.
Transparent optical signal regeneration is demonstrated using a nonlinear bistable distributed-feedback/Fabry-Perot structure, which has a high switching contrast (>40:1), fast recovery time (4 ns) and low threshold power (2 mW).<<ETX>>
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