A High-speed Quantum Key Distribution System Based on Phase Modulation and Polarization Coding

Abstract

The invention provides a high-speed quantum secret key distribution system of phase modulation polarization coding. The high-speed quantum secret key distribution system of the phase modulation polarization coding comprises a transmitter FPGA chip, a clock signal, a laser, an intensity modulator, a first polarization beam splitter and so on; wherein the transmitter FPGA chip is used for generatingrandom numbers, recording the generated random numbers, and driving the intensity modulator and a phase modulator; the clock signal is used for realizing the clock consistency between the transmitterand the receiver; the laser is used as a light source; the intensity modulator is used for receiving the random number signals transmitted by the FPGA, generating different modulation intensity and forming a decoy state; and the first polarization beam splitter is used for performing beam splitting on laser pulses. The high-speed quantum secret key distribution system of the phase modulation polarization coding improves the traditional quantum communication sending end, and adopts a single laser source; therefore, the noise and jitter caused by the differences of each laser are reduced, the number of the devices of the sending end is reduced, the complexity degree of the optical path is simplified, the bit error rate caused by the clock jitter is reduced, the redundant optical path structure in the prior art is improved, the system is simplified, and the cost is saved.

Description

technical field [0001] The invention relates to the field of quantum secure communication, in particular to a high-speed quantum key distribution system for phase modulation and polarization encoding. Background technique [0002] The development of human communication systems has always been inseparable from the word "security". Whether it is the Morse code and Enigma code in the last century, or the RSA public key encryption algorithm proposed in 1977, they all came into being for information security. [0003] Since the quantum computer system was proposed, the recognized security of RSA has been greatly threatened, and traditional encryption methods are no longer sufficient to ensure the security of information during communication and processing. Therefore, the "one-time pad" quantum key distribution system (QKD) has also been proposed. So far, long-distance, high-speed QKD systems have been continuously designed. Due to its "uncertainty principle" based on quantum ch...

AI Technical Summary

Problems solved by technology

[0003] Since the quantum computer system was proposed, the recognized security of RSA has been greatly threatened, and the traditional encryption method is no longer enough to ensure the security of information in the process of communication and processing.

Images