Quantum cryptocommunication transmitter transmitting/receiving device and system

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PROBLEM TO BE SOLVED : Wiretapper can detect the presence of, and communication rate can be increased to provide a quantum cryptocommunication system. SOLUTION : The quantum cryptocommunication system, a transmitter and receiver reception device between the transmitter, the transmitter from the receiver to the transmitter and reception device polarizer according to the quantum state of a light pulse coded and transmitted to the transmission side and communication channel receiver side between the transmitter and the transmitter in the quantum cryptocommunication procedure related items used to connect a quantum cryptocommunication system disclosed in the channel, the transmitter, the transmitter, each of which includes a small average number of photons is rare and single photon light pulse, even after reception of which includes a large number of photons and an average of a plurality of photon optical pulse train, including transmitting means for transmitting a light pulse. Selected drawing : Fig. 2