An on-chip decoder for the temporal bb84 protocol

Abstract

The invention discloses an on-chip decoder and a decoding method for a time BB84 protocol. The decoder comprises an input waveguide (100); a 1*2 light beam splitter (200) used for splitting the received signal light into two beams of signal light with equal intensity; an optical delay line (300) used for delaying the signal light; a variable optical attenuator (400) used for enabling the light intensity of the signal light to be consistent with the light intensity of the signal light delayed by the light delay line (300); a phase bias modulator (500) for adjusting the phase of the received signal light; a 2*2 interference coupler (600) used for carrying out ermeter operation on the received signal light; and an output waveguide (700) for outputting the signal light. According to the decoder and the decoding method, any four kinds of quantum state signal light meeting the time BB84 protocol can be passively demodulated, and for phase drift in an optical fiber channel and an interferenceloop, the device can achieve accurate compensation through on-chip regulation and control.

Description

technical field [0001] The invention relates to the technical field of quantum communication and integrated optics, in particular to an on-chip decoder and a decoding method for the time BB84 protocol. Background technique [0002] The currently recognized quantum key distribution devices are mainly based on traditional discrete optical prisms or fiber optic devices, which are bulky, difficult to integrate, and costly, which is not conducive to large-scale commercialization. With the development of silicon-based photonics, the functions of discrete optical devices can gradually be realized on-chip, which facilitates integration. At the same time, using mature silicon device processing platforms, large-scale and low-cost mass production can be realized. So people began to try to integrate the devices and subsystems required by the quantum key distribution device on the chip. For the quantum key distribution of the time BB84 protocol, the setting of the demodulation end gener...

AI Technical Summary

Problems solved by technology

[0004] Based on the above technical problems, the present invention provides an on-chip decoder and decoding method for the time BB84 protocol, which is used to solve the problem of the large size and high cost of discrete components in the traditional solution and the inability to make time BB84 under different preparation bases in the prior art. Protocol demodulation, inability to achieve on-chip phase compensation, etc.

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