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Quantum cryptography with a two-way quantum channel


It is a common belief that two-way quantum channels can not represent a practical tool for quantum cryptography because of their high loss rate.  I will debate this question by an explicit example of a two-way quantum cryptosystem that provides key distribution rates higher than its one-way counterpart on a small- and medium-scale distance.  I will also present other potentialities and a few experimental results pertaining to this new protocol.