Bidirectional continuous variable quantum key distribution method and system based on single transceiver ring network architecture and frequency division duplex technology

By using a single transceiver ring network architecture and frequency division duplex technology, the problems of high fiber resource consumption and severe Rayleigh scattering noise in existing technologies are solved, achieving efficient single-fiber bidirectional quantum key distribution and supporting flexible construction of metropolitan quantum ring networks.

CN122179093APending Publication Date: 2026-06-09SHANGHAI QUANTUM SCI RES CENT +1
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Patent Information

Application Number
CN202610251189.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-03
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing integrated continuous variable quantum key distribution schemes face challenges in building flexible network topologies, including high fiber resource consumption, high node costs, severe Rayleigh scattering noise, and on-chip crosstalk, making it difficult to achieve efficient single-fiber bidirectional transmission and flexible networking.

Method used

By employing a single transceiver ring network architecture and frequency division duplex technology, high-quality bidirectional quantum keys are generated by generating frequency division duplex signals on a single integrated chip and using digital signal processing technology for noise isolation and signal recovery.

Benefits of technology

It realizes full-duplex quantum communication within a single optical fiber, improves the utilization rate of optical fiber resources and the flexibility of network deployment, reduces node costs, suppresses Rayleigh scattering noise and reduces on-chip crosstalk, and supports the construction of flexible metropolitan quantum ring networks.

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Abstract

The invention discloses a bidirectional continuous variable quantum key distribution method and system based on frequency division duplex in a single transceiver looped network. According to the method, on the basis of a monolithic integrated silicon optical transceiver chip, optical carrier frequency offset is preset for forward and reverse links, and quantum signals and optical fiber Rayleigh backscattering noise are isolated in a frequency domain. A sending end generates a broadband waveform containing a sub-signal and a pilot signal, and the broadband waveform is bidirectionally transmitted through a single optical fiber; and a receiving end performs coherent heterodyne detection by using the laser source of the same chip as local oscillation light. The digital signal processing module performs orthogonalization correction, phase recovery and matched filtering, suppresses noise and extracts quantum signals to generate a security key. According to the method, the problems of inflexible networking, low optical fiber utilization rate and serious scattering noise interference in single-fiber two-way transmission caused by receiving and transmitting separation of an integrated continuous variable quantum key distribution system are solved, and a low-cost and high-flexibility solution is provided for the metropolitan area quantum ring network.
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