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

Abstract

The invention discloses a space division multiplexing continuous variable quantum communication encryption system and a realization method. The transmitting end uses the optical add-drop multiplexer to multiplex the continuous variable quantum signal, clock signal and classical signal, and then space-multiplexes the multiple wavelength-division multiplexed signals through the space-division multiplexing device and sends them to the multi-channel A communication channel composed of core fiber or few-mode fiber. The receiving end first demultiplexes the signal in the communication channel through the space division multiplexing device, and then demultiplexes each wavelength division multiplexing signal through the optical add-drop multiplexer, and finally receives the continuous variable quantum signal through the continuous variable quantum signal receiving end. The variable quantum signal receives the clock signal and the classical signal respectively through the classical signal transceiver. The invention realizes the simultaneous space division multiplexing transmission of continuous variable quantum communication and classical signal for multi-core optical fiber and few-mode optical fiber, and can further improve the security key rate of the continuous variable quantum communication encryption system.

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...

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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

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