LLO-based single-wavelength quantum and classical communication simultaneous transmission method

Abstract

The invention discloses an LLO-based single-wavelength quantum and classic communication simultaneous transmission method. A multi-user Alice terminal, a multiplexing module and a multi-user Bob terminal are included, and the multi-user Alice terminal, the multiplexing module and the multi-user Bob terminal are connected in sequence through optical fibers. Quantum signals and classic signals are coded on the same weak coherent pulse by adopting a single-wavelength multiplexing method, so that additional requirements of QKD for hardware equipment are reduced, and the practicability of the QKD technology is improved. The LLO scheme is adopted to close security vulnerabilities brought by an eavesdropper by manipulating the LO on the common channel, and the LLO is realized by adopting the unbalanced delay line interferometer, so that the system can tolerate stronger phase noise. Wavelength division multiplexing is combined with single-wavelength multiplexing, the system capacity of the system is further improved, and a realistic way is opened up for developing a coherent quantum and classical fusion system compatible with a next-generation network.

Description

technical field [0001] The invention relates to the field of quantum information, in particular to an LLO-based single-wavelength quantum and classical communication simultaneous interpretation system and simultaneous interpretation method. Background technique [0002] One of the most practical applications of quantum information science is the so-called QKD (Quantum Key Distribution) technology, which allows two remote parties (traditionally called Alice and Bob) Insecure quantum channels generate secure keys. The security key can be further applied to other cryptographic protocols to enhance communication security. But one of the main obstacles to the widespread application of QKD is the high cost, since dedicated communication infrastructures (such as dark fibers) and expensive devices (such as single-photon detectors) need to be used in QKD systems. Therefore, it is necessary to propose cost-effective QKD solutions. In order to reduce costs and increase the efficienc...

AI Technical Summary

Problems solved by technology

However, different hardware devices are used for the quantum signal and the classical signal, resulting in high cost of fusion transmission. The present invention proposes to transmit the CV-QKD signal and the classical signal under a single wavelength pulse, and the quantum signal and the classical signal share the transmitter and detectors, offering a viable solution in terms of practicality and low-cost implementa

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