Space division multiplexing continuous variable quantum communication encryption system and implementation method

Abstract

The invention discloses a space division multiplexing continuous variable quantum communication encryption system and an implementation method. And the sending end performs wavelength division multiplexing on the continuous variable quantum signal, the clock signal and the classic signal through an optical add-drop multiplexer, performs space division multiplexing on multiple paths of wavelength division multiplexing signals through space division multiplexing equipment, and sends the signals to a communication channel formed by a multi-core optical fiber or a few-mode optical fiber. A receiving end firstly demultiplexes signals in a communication channel through space division demultiplexing equipment, then demultiplexes each path of wavelength division multiplexing signals through an optical add-drop multiplexer, finally receives continuous variable quantum signals through a continuous variable quantum signal receiving end, and respectively receives clock signals and classic signalsthrough a classic signal transceiver. According to the invention, continuous variable quantum communication and space division multiplexing transmission of classic signals are carried out simultaneously for the multi-core optical fiber and the few-mode optical fiber, and the safety key rate of a continuous variable quantum communication encryption system can be further improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber quantum communication, and relates to a space division multiplexing continuous variable quantum communication encryption system and an implementation method. Background technique [0002] Quantum communication enables legitimate communication parties to safely share keys in an untrusted quantum channel, and its security features are based on the uncertainty principle of quantum mechanics and the quantum non-cloning theorem. At present, quantum communication is divided into two directions: discrete variable and continuous variable according to the difference of information carrier. Compared with the discrete variable quantum communication protocol, the quantum state of the continuous variable quantum communication is easier to prepare, can be integrated into the existing optical fiber system, and can use high-efficiency and low-cost homodyne detection or heterodyne detection technology, which...

AI Technical Summary

Problems solved by technology

[0005] In order to achieve the above object, the present invention provides a space-division multiplexing continuous variable quantum communication encryption system, which solves the problem that the key bit rate of continuous variable quantum communication is still relatively low in the prior art, and the continuous variable quantum communication cannot be compared with classical signals. problem of coexistence

Images