Post-processing system and method for phase polarization joint modulation QKD

Abstract

The invention discloses a post-processing system for phase polarization joint modulation QKD. The system comprises a sender and a receiver. Each of the sender and the receiver comprises an informationinteraction unit, a parameter estimation unit, an error correction unit and a confidentiality amplification unit which are connected in sequence. The information interaction unit, the parameter estimation unit, the error correction unit and the confidentiality amplification unit of the sender are respectively connected with the information interaction unit, the parameter estimation unit, the error correction unit and the confidentiality amplification unit of the receiver in a one-to-one correspondence manner through channels. According to the invention, aiming at the characteristics of a phase polarization joint modulation QKD system and a double-speed protocol used by the phase polarization joint modulation QKD system, a traditional transceiver base vector comparison step is not needed in the information interaction unit, so that the information interaction amount is reduced, and the post-processing efficiency is improved; and the parameter estimation unit estimates the bit error rate of the key by using a packet parity check method, and selects a reasonable error correction method and a secrecy amplification method after estimating channel parameters, so that the correctness andthe safety of quantum key distribution are improved by the steps.

Description

technical field [0001] The invention relates to the field of quantum security communication and optical fiber communication, in particular to a post-processing system and method for phase-polarization joint modulation QKD. Background technique [0002] With the rapid development of various modern technologies such as network technology and communication technology, on the one hand, the amount of communication information has exploded exponentially; research hotspot. Since Shannon introduced information theory into cryptography in 1949, it has established a theoretical foundation for modern cryptography. For decades, experts and scholars have devoted themselves to the field of cryptography, promoting the development of the discipline. At present, the encryption algorithm widely used in the military, commercial and civilian fields is an asymmetric encryption algorithm based on the one-way complexity of the large number prime factorization, that is, the RSA algorithm. However...

AI Technical Summary

Problems solved by technology

However, in 1994, P. Shor proposed an algorithm running on a quantum computer, which can crack the RSA public key cryptosystem in a short time, which means that the classical encryption algorithm based on mathematical complexity will have no secrets to keep

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