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Enhanced Superdense Coding over Correlated Amplitude Damping Channel.

Yan-Ling Li1, Dong-Mei Wei1, Chuan-Jin Zu1

  • 1School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.

Entropy (Basel, Switzerland)
|December 3, 2020
PubMed
Summary

Researchers improved superdense coding using weak and environment-assisted measurements to combat correlated amplitude damping (CAD) decoherence. Environment-assisted measurement proved superior for enhancing capacity and success probability in noisy quantum communication.

Keywords:
correlated amplitude damping channelenvironment-assisted measurementsuperdense codingweak measurement

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Area of Science:

  • Quantum Information Science
  • Quantum Communication

Background:

  • Realistic quantum communication channels often exhibit correlated effects, especially when used consecutively.
  • Correlated amplitude damping (CAD) poses a significant challenge to the fidelity of quantum information transfer.

Purpose of the Study:

  • To reexamine superdense coding under a CAD channel.
  • To investigate methods for enhancing superdense coding capacity in the presence of correlated noise.

Main Methods:

  • Utilizing weak measurement techniques.
  • Employing environment-assisted measurement strategies.
  • Analyzing the impact of these techniques on superdense coding capacity under CAD.

Main Results:

  • Both weak measurement and environment-assisted measurement can mitigate CAD decoherence.
  • Both techniques demonstrate an improvement in superdense coding capacity with a certain probability.
  • Environment-assisted measurement consistently outperforms weak measurement in enhancing capacity and success probability.

Conclusions:

  • Weak measurement and environment-assisted measurement are effective strategies against CAD decoherence in superdense coding.
  • Environment-assisted measurement offers superior performance due to its ability to extract additional environmental information.
  • These findings provide valuable insights for developing more robust quantum communication protocols.