A kind of on-chip decoder and decoding method for time bb84 protocol

Abstract

An on-chip decoder and decoding method for the time BB84 protocol, the decoder includes: an input waveguide (100); a 1×2 optical beam splitter (200), which is used to divide the received signal light into two beams of equal intensity Signal light; optical delay line (300), used to delay the signal light; adjustable optical attenuator (400), used to make the light intensity of the signal light and the signal delayed by the optical delay line (300) The light intensity of the light is consistent; the phase bias modulator (500) is used to adjust the phase of the received signal light; the 2×2 interference coupler (600) is used to perform Hermitian calculation on the received signal light; the output The waveguide (700) is used to output the signal light. The on-chip decoder and decoding method can passively demodulate any four quantum state signal lights satisfying the time BB84 protocol, and for the phase drift in the optical fiber channel and interference loop, the device can realize accurate compensation through on-chip regulation.

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 decoding method for time BB84 protocol. Background technique [0002] Quantum cryptography is the product of the combination of quantum mechanics and cryptography, which solves the problem of key distribution in classical cryptosystems. It uses the basic principles of quantum mechanics - the uncertainty principle and the non-cloning theorem of single quantum states, to ensure that the data in the public channel does not have to worry about being eavesdropped during the key distribution process. 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 d...

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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