A Quantum Key Distribution System Based on Frame-Independent Protocol

Abstract

The invention discloses a quantum key distribution system based on a reference frame-independent protocol, which uses light injection semiconductor lasers to generate quantum states with encoded information, replacing the traditional scheme of light sources and quantum state encoding modules. The photon time and phase difference information is generated by the light injection semiconductor laser in the quantum key encoding end, the first laser driver, the second laser driver, the pulse generation laser, the phase preparation laser, the first three ports in the quantum key encoding end The circulator forms the light injection semiconductor laser, and the second laser driver controls the phase preparation laser to inject the phase-modulated optical pulse with the pre-adjusted Δφ phase into the pulse generation laser, so that the pulse generation laser controlled by the first laser driver can generate a pair of phase difference Δφ Double-pulse signal light, thereby generating a pulse sequence with time and phase encoding information. The technical solution improves the anti-interference and coding rate of the system, and is beneficial to product integration and miniaturization.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to a quantum key distribution system based on a reference frame independent protocol. Background technique [0002] Secure communication is a communication system that encrypts the code stream of the transmitted information source at the sending end and decrypts and authenticates at the receiving end to prevent information from being disturbed or eavesdropped. It can ensure the security and integrity of the information transmitted by both parties in communication. At present, the RSA public key system is generally used in secure communication. The security of this public key system is guaranteed by the complexity of the algorithm and the limitation of computer computing power. It threatens the security of the existing RSA public key system. As a reliable key distribution system, quantum key distribution (QKD) is guaranteed by quantum characteristics such as the Heisenberg uncer...

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Problems solved by technology

In this document, the optical injection laser prepares two optical pulses or three pulses in one cycle, and the phase difference between two pulses is 4 values One of them corresponds to the four quantum states of the two groups of basis vectors, where 0 and π correspond to the X basis vectors, Corresponding to the Y base vector, the experimental research in this document can be used to realize the BB84 protocol or the DPS protocol, but it cannot be directly used to realize the reference frame independent protocol

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