Сверхпроводниковый детектор с разрешением числа фотонов для телекоммуникаций и квантовой криптографии
A. Semenov, Рябчун Сергей Александрович, А. А. Шишов +5 more
Detector of novel type for quantum key distribution and telecommunications, a photon-number resolving superconducting nanowire detector, is proposed. The Poisson distribution is utilized to describe statistics of incoming photons and photo-counts of the detector and to derive relations for bit-error ratio. Number of photons per pulse required to obtain acceptable bit error ratio while using the detector in classic communication channel is estimated. Qualitative formula is derived, describing dependency of required average number of photons per pulse on bit-error ratio in the limit of high signal-to-noise ratio of the line. The formula can be used for characterizing applicability of photon-number resolving detectors in telecommunication protocols with the required bit-error ratio. The numerical calculations are performed, confirming applicability of the analytical formula. Thereby, the availability of superconducting nanowire detector for long-distance telecommunication with standard single-mode fiber is demonstrated.
Современные проблемы науки и образования•Jan 1, 2012•0 citations