FIELD: cryptography.
SUBSTANCE: invention relates to systems for quantum sending of a cryptographic key. Device for quantum sending of a cryptographic key with frequency coding contains a transmitting device and a receiving device interconnected by a fiber-optic communication line; as well as synchronization unit; wherein the transmitting device includes a monochromatic radiation source, an electrooptical phase modulator of the transmitting device, an attenuator, a phase shift device of the transmitting device, a radio frequency transmitter of the transmitting device; wherein the receiving device includes an electrooptical phase modulator of the receiving device, an optical circulator, a spectral filter, a single photon receiver, a classical radiation receiver, a phase shift device of the receiving device, a radio frequency signal generator of the receiving device, wherein transmitting device further includes electrooptical amplitude modulator of transmitting device and converter of radio frequency signal of transmitting device; receiving device also additionally includes electrooptical amplitude modulator of receiving device, converter of radio frequency signal of receiving device.
EFFECT: high reliability of sending a cryptographic key through a quantum channel.
1 cl, 9 dwg
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