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It is shown that there is no formal limit on the length of the communication channel in a single-photon quantum cryptosystem with arbitrary dispersion if there is no damping in the communication line. A prescription is given for finding a signal shape such that the total duration of the signal at the entrance and exit of the communication channel can be made arbitrarily small. Such a signal is in a certain sense optimal.
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Molotkov et al. (1996) studied this question.
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