FIELD: optical communication.
SUBSTANCE: invention relates to the technique of optical communication, it can be used in systems of photonic quantum communication. An optical insulator is introduced into a transmitting device, included between a source of monochromatic radiation and an optical phase modulator, and a circulator and a block for registering a central component in the spectrum of the phase-modulated state are introduced into the receiving device.
EFFECT: increased maximum distance of quantum information transmission.
1 cl, 1 dwg
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