QUANTUM DISTRIBUTION DEVICE FOR A CRYPTOGRAPHIC KEY WITH FREQUENCY CODING Russian patent published in 2022 - IPC H04B10/85 H04L9/08 

FIELD: cryptographic key quantum distribution systems.

SUBSTANCE: invention relates to systems for quantum distribution of a cryptographic key. The device for quantum distribution of a cryptographic key with frequency coding contains a transmitting device and a receiving device connected to each other by a fiber-optic communication line. The transmitter includes a source of monochromatic radiation, an electro-optical amplitude modulator of the transmitter, an electro-optical phase modulator of the transmitter, an attenuator, a phase shifter of the transmitter, an RF signal generator of the transmitter, and an RF signal converter of the transmitter. The receiving device includes a spectral filter, a classical radiation receiver, the first single photon receiver, the goal is achieved by the fact that the transmitter phase adjustment device is additionally introduced into the transmitter, while the spectral filter in the receiver is multichannel and has five outputs, also in the receiver The device additionally introduced a second single photon receiver, a third single photon receiver, a fourth single photon receiver.

EFFECT: reduction of the quantum error rate, due to completely passive filtering of data on the receiving device.

1 cl, 12 dwg