TWO-PASS PHASE MODULATION SYSTEM FOR QUANTUM KEY DISTRIBUTION Russian patent published in 2022 - IPC H04L9/08 

FIELD: optics.

SUBSTANCE: invention relates to a two-pass phase modulation system for quantum key distribution. The two-pass phase modulation system for quantum key distribution with a strong reference impulse contains receiving and transmitting devices connected by a quantum channel, wherein the transmitting device contains the first circulator, the second circulator, a variable optical attenuator, a phase modulator, a beam splitter, a synchronous detector, at least two insulators, an accumulation line, a Faraday’s mirror, a polarization controller, the receiving device contains a laser, a circulator, the first beam splitter, at least two single photon detectors, the second beam splitter, a variable optical attenuator, a phase modulator, a photodetector, an optical terminator, a Mach-Zehnder interferometer with a delay line, a polarization beam splitter.

EFFECT: provision of the possibility of quantum key distribution with a strong reference impulse.

2 cl, 5 dwg