DEVICE FOR QUANTUM DISTRIBUTION OF A SYMMETRIC BIT SEQUENCE AT A SUBCARRIER FREQUENCY OF MODULATED RADIATION USING A HETERODYNE RECEPTION METHOD Russian patent published in 2021 - IPC H04L9/08 

FIELD: photonic quantum communication systems.

SUBSTANCE: invention relates to photonic quantum communication systems. The device contains a sender unit, which includes a coherent radiation source connected by means of a fiber-optic path to an optical insulator, an optical phase modulator and an attenuator, as well as a receiver unit, an optical circulator, a spectral filter that separates and directs optical radiation to the corresponding arms of a balanced detector, in addition, the sender unit includes a computer and an FPGA connected to it, a control voltage generator (CVG) and an input of an electric phase modulator are connected to the FPGA on the sender's side, the output of which is connected to an optical phase modulator, in addition, a phase-lock loop system (PLL) is connected to an electrical phase modulator, which, in turn, is coupled to the control voltage generator, the FPGA is also connected to the sender’s SFP standard module, which, in turn, is connected to the receiver’s SFP standard module via a fiber-optic communication line, the receiver unit also includes a computer, an FPGA coupled to it, a low-pass filter connected to the FPGA, in addition, in the receiver unit there is a signal analyzer, coupled with a computer and the output of a balanced detector.

EFFECT: providing a device for quantum distribution of symmetric bit sequences with an expanded scope of application.

1 cl, 2 dwg