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Realization of Quantum Secure Direct Communication with Continuous Variable.

Zhengwen Cao1, Yuan Lu1, Geng Chai1

  • 1School of Information Science and Technology, Northwest University, Xi'an710127, China.

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|July 17, 2023
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Summary
This summary is machine-generated.

Quantum secure direct communication (QSDC) offers a solution to threats from quantum computing. This study demonstrates the first continuous-variable QSDC experiment, proving its feasibility over fiber channels.

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Area of Science:

  • Quantum Information Science
  • Secure Communication Technologies

Background:

  • Classical encryption is vulnerable to quantum and distributed computing advancements.
  • Quantum secure direct communication (QSDC) directly encodes information onto quantum states for enhanced security.

Purpose of the Study:

  • To experimentally demonstrate continuous-variable QSDC (CV-QSDC) feasibility.
  • To validate a CV-QSDC protocol using Gaussian mapping.
  • To propose a parameter estimation method for signal classification in real-world channels.

Main Methods:

  • Experimental demonstration of a CV-QSDC protocol.
  • Utilizing Gaussian mapping for information encoding.
  • Implementing parameter estimation for signal classification and grading.

Main Results:

  • Successful transmission of 4 × 10^2 blocks, each with 10^5 data points.
  • Achieved a transmission rate of 4.08 × 10^5 bits per second over a 5 km fiber channel.
  • Measured excess noise of 0.0035 shot-noise units (SNU).

Conclusions:

  • The experimental results confirm the feasibility and effectiveness of CV-QSDC in practical fiber channels.
  • The proposed parameter estimation method provides a viable scheme for message processing in CV-QSDC.
  • This work lays the foundation for advanced grading reconciliation techniques in secure communication.