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Control Power in Continuous Variable Controlled Quantum Teleportation.

Yuehan Tian1,2, Dunbo Cai3, Nengfei Gong1,2

  • 1State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Entropy (Basel, Switzerland)
|January 8, 2025
PubMed
Summary
This summary is machine-generated.

We quantified control power in continuous variable controlled quantum teleportation, finding it increases with photon number. This offers a higher upper bound than discrete variable methods, crucial for quantum networks.

Keywords:
continuous variable quantum systemscontrol powercontrolled quantum teleportation

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Networks
  • Quantum Entanglement

Background:

  • Controlled quantum teleportation is vital for quantum networks.
  • Continuous variable (CV) protocols offer deterministic entanglement and enhanced control.
  • Existing measures for control power in CV settings are limited.

Purpose of the Study:

  • To define and quantify control power in CV controlled quantum teleportation.
  • To investigate the influence of photon number on control power.
  • To establish a criterion for evaluating quantum communication network quality.

Main Methods:

  • Utilizing Greenberger-Horne-Zeilinger-type entangled coherent state channels.
  • Developing a novel measure for control power in CV teleportation.
  • Analyzing protocol robustness against photon absorption.

Main Results:

  • Control power in CV controlled quantum teleportation scales with mean photon number.
  • The upper bound for control power is 1/2, exceeding the discrete variable limit of 1/3.
  • Photon loss degrades control power but does not alter the upper bound, indicating robustness.

Conclusions:

  • The defined measure effectively quantifies control power in CV controlled quantum teleportation.
  • CV protocols offer superior control capabilities for quantum networks compared to discrete variable approaches.
  • This work provides a valuable metric for assessing multipartite CV quantum information processing and network quality.