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Experimental long-distance quantum secure direct communication.

Feng Zhu1, Wei Zhang1, Yubo Sheng2

  • 1Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China.

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This study presents the first long-distance quantum secure direct communication (QSDC) experiment, achieving high fidelity over 0.5 km. The research demonstrates QSDC

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Area of Science:

  • Quantum Communication
  • Quantum Information Science

Background:

  • Quantum secure direct communication (QSDC) enables direct, secure information transmission without encryption.
  • Previous QSDC experiments were limited to table-top setups.

Purpose of the Study:

  • To report the first long-distance QSDC experiment.
  • To assess the feasibility of QSDC over practical fiber optic links.

Main Methods:

  • Conducted a QSDC experiment involving security testing, information encoding, fiber transmission (0.5 km), and decoding.
  • Utilized polarization-entangled Bell states for information coding.

Main Results:

  • Achieved quantum state fidelities of 91% and 88% for the two Bell states after 0.5 km fiber transmission.
  • Theoretically projected the possibility of QSDC over tens of kilometers using current optical technologies.

Conclusions:

  • The experiment validates the potential of long-distance QSDC.
  • Results support the integration of QSDC into future quantum communication networks.