Quantum state decoding device, method and software-defined quantum communication system

By introducing a polarization-to-time phase coding unit and decoding control instructions into the quantum state decoding device, compatible decoding of polarization coding and time phase coding is achieved, which solves the versatility and flexibility problems of existing quantum communication system decoding devices and improves the adaptability and accuracy of the system.

CN118921123BActive Publication Date: 2025-09-23CHINA ACADEMY OF ELECTRONICS AND INFORMATION TECHNOLOGY OF CHINA ELECTRONICS TECHNOLOGY GROUP CORPORATION
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Patent Information

Application Number
CN202410978725.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-19
Publication Date
2025-09-23
Estimated Expiration
2044-07-19

AI Technical Summary

Technical Problem

The decoding devices of existing quantum communication systems are not compatible with multiple encoding methods, lack versatility and flexibility, and cannot be flexibly networked in different environments.

Method used

A quantum state decoding device is composed of a first optical coupling unit, a polarization-to-time phase encoding unit, a first transmission optical path, a second optical coupling unit and a time phase decoding unit. Compatible decoding of polarization encoding and time phase encoding is achieved through polarization-to-time phase encoding conversion and decoding control instructions.

Benefits of technology

A decoding method that is compatible with time phase coding and polarization coding in the same quantum state decoding device has been realized, which improves the flexibility and adaptability of the quantum communication system and meets the decoding needs in different environments.

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Abstract

The present application provides a quantum state decoding device, method, and software-defined quantum communication system. The device includes: a first optical coupling unit, a polarization-to-time phase encoding unit, a first transmission optical path, a second optical coupling unit, and a time phase decoding unit. The polarization-to-time phase encoding unit is used to perform time phase encoding conversion on input polarization-encoded quantum state optical pulses and output time phase-encoded quantum state optical pulses. The time phase decoding unit can decode and output the time phase-encoded quantum state optical pulses. The first optical coupling unit and the second optical coupling unit can control the output of time phase-encoded quantum state optical pulses from any optical output branch according to quantum communication decoding control instructions. In this way, the decoding methods of time phase encoding and polarization encoding can be compatible in a quantum state decoding device.
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Citation Information

Patent Citations

  • Bit-phase decoding method and device for quantum key distribution time and corresponding system

    CN109150522A

  • Time phase-polarization coding device, decoding device and quantum communication system

    CN109560876A