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Hadfield RH, Habif JL, Schlafer J, Schwall RE, Nam SW. Quantum key distribution at 1550 nm with twin superconducting single-photon detectors. Appl Phys Lett. 2006;89(24):241129.
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Stucki D, Walenta N, Vannel F, Thew RT, Gisin N, Zbinden H, et al. High rate long-distance quantum key distribution over 250 km of ultra low loss fibres. New J. Phys.. 2009;11(7):075003.
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