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Free space QKD over an atmospheric channel was demonstrated in 1996 for the first time. Since then, several prepare-and-measure and entanglement-based schemes have been implemented (for a detailed overview, see). All of these systems use single-photon detectors, and therefore have to employ spatial, spectral and/or temporal filtering in order to reduce background light. In our system, we use an alternative...
Detection at optical communication wavelength is achieved, for the first time, in GaAs phototube by non degenerate two-photon absorption. Signal photon is supported by a pump field, producing a quantum ldquoleg uprdquo effect.
With photon-number resolving detectors, we show compression of interference fringes with increasing photon numbers for both Michelson and Fabry-Perot interferometers. We also theoretically show supersensitivity for nonclassical light.
The reported experiment observed a nontrivial third-order temporal correlation of chaotic-thermal light in the joint-detection of three individual photodetectors. It seems that the thermal photons are always ldquobunchedrdquo in triples. In the view of quantum mechanics, ldquothree-photon bunchingrdquo is a three-photon interference effect.
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