DEVICE OF QUANTUM CRYPTOGRAPHY (VERSIONS) Russian patent published in 2017 - IPC H04L9/30 H04L9/08 H04B10/25 

FIELD: physics.

SUBSTANCE: quantum cryptography device includes a radiation source, a first fiber beam splitter, a fiber interferometer, a second fiber beam splitter, a first phase modulator, a third fiber beam splitter, a detector, an attenuator, a delay line, a polarization filter, a second phase modulator, a fiber mirror and a single photon detector. The elements listed above are interconnected by means of an optical fiber that preserves the polarization state.

EFFECT: increasing the stability of the work of the device of quantum cryptography due to the conservation of the polarization state along the whole way of the optical path.

26 cl, 7 dwg