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Realization of Quantum Secure Direct Communication with Continuous Variable

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With the progress of theoretical and applied technologies,the communication system based on the classical encryption is seriously threatened by quantum computing and distributed computing.A communication method that directly loads confidential information on the quantum state,quantum secure direct communication(QSDC),came into being for resisting security threats.Here,we report the first continuous-variable QSDC(CV-QSDC)experimental demonstration for verifying the feasibility and effectiveness of the CV-QSDC protocol based on Gaussian mapping and propose a parameter estimation for signal classification under the actual channels.In our experiment,we provided 4 ×102 blocks,where each block contains 105 data for direct information transmission.For the transmission distance of 5 km in our experiment,the excess noise is 0.0035 SNU,where SNU represents the unit of shot-noise units.The 4.08×105 bit per second experimental results firmly demonstrated the feasibility of CV-QSDC under the fiber channel.The proposed grading judgment method based on parameter estimation provides a practical and available message processing scheme for CV-QSDC in a practical fiber channel and lays the groundwork for the grading reconciliation.

Zhengwen Cao、Yuan Lu、Geng Chai、Hao Yu、Kexin Liang、Lei Wang

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School of Information Science and Technology,Northwest University,Xi'an710127,China

National Natural Science Foundation of ChinaShaanxi Provincial Key R&D Program General ProjectQinchuangyuan"Scientist+Engineer"Team Construction Project of Shaanxi Province of ChinaYoung Talent Fund of Xi'an Association for Science and Technology

620713812022GY-0232022KXJ-009959202313011

2024

10.34133/research.0193

研究(英文)

研究(英文)

CSTPCD
ISSN：
年,卷(期)：2024.2024(2)
  • 64