A Note on Quantum Key Channel Efficiency and Security using Correlated Photon Beam Transmitters
Edwards, PJ · Cheung, W N · van Pham, H · Ganesharajah, G · Lynam, P · Barbopoulos, L
الأصل · EN
Quantum-correlated photon sources provide a means of suppressing multiple photon emission and thus improving the security and efficiency of quasi single-photon quantum key distribution systems. We present illustrative photon-counting statistics for a Poissonian source conditioned by photon number measurements on a fully correlated twin beam with a non-ideal photon counter. We show that high photon counting efficiency is needed to obtain significant improvement in channel efficiency (bits per symbol) and/or security (in the form of reduced Shannon entropy leakage) over a single beam source.
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