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- W2238365864 abstract "We discuss the possibility of polarization state reconstruction and measurement over 302 km by Superconducting Single-Photon Detectors (SSPDs). Because of the excellent characteristics and the possibility to be effectively coupled to single-mode optical fiber many applications of the SSPD have already been reported. The most impressive one is the quantum key distribution (QKD) over 250 km distance. This demonstration shows further possibilities for the improvement of the characteristics of quantum-cryptographic systems such as increasing the bit rate and the quantum channel length, and decreasing the quantum bit error rate (QBER). This improvement is possible because SSPDs have the best characteristics in comparison with other single-photon detectors. We have demonstrated the possibility of polarization state reconstruction and measurement over 302.5 km with superconducting single-photon detectors. The advantage of an autocompensating optical scheme, also known as plug&play for quantum key distribution, is high stability in the presence of distortions along the line. To increase the distance of quantum key distribution with this optical scheme we implement the superconducting single photon detectors (SSPD). At the 5 MHz pulse repetition frequency and the average photon number equal to 0.4 we measured a 33 bit/s quantum key generation for a 101.7 km single mode ber quantum channel. The extremely low SSPD dark count rate allowed us to keep QBER at 1.6% level. .HZRUGV Quantum key distribution, quantum communication , quantum cryptography, superconducting single-photon detectors." @default.
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- W2238365864 date "2014-01-01" @default.
- W2238365864 modified "2023-09-26" @default.
- W2238365864 title "Quantum key distribution over 300km" @default.
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