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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Quantum Teleportation and Dense Coding in Multiple Bosonic Reservoirs.

Yu Wang1, Ming-Liang Hu2

  • 1School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China.

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|August 26, 2022
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Summary

Multiple bosonic reservoirs can revive quantum communication advantages, like quantum teleportation and dense coding, after they disappear. This non-Markovian effect shows a delayed revival of quantum benefits, depending on information backflow accumulation.

Keywords:
dense codingnon-Markovianityquantum teleportation

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Protocols
  • Quantum Optics and Condensed Matter Physics

Background:

  • Quantum communication protocols, including quantum teleportation and dense coding, are sensitive to environmental noise.
  • The spectral density of reservoirs significantly influences the performance and fidelity of quantum information transfer.
  • Understanding the impact of multiple simultaneous reservoirs on quantum channel qubits is crucial for robust quantum communication.

Purpose of the Study:

  • To investigate the efficiency of quantum teleportation and dense coding when channel qubits interact with multiple bosonic reservoirs.
  • To explore the role of non-Markovianity, induced by reservoir interactions, in the revival of quantum advantages.
  • To analyze the relationship between information backflow and the timing of quantum advantage revivals in these protocols.

Main Methods:

  • Theoretical analysis of quantum communication protocols under the influence of multiple bosonic reservoirs.
  • Modeling qubit-reservoir coupling to study spectral density effects and non-Markovian dynamics.
  • Investigating the conditions under which quantum advantages reappear due to information backflow.

Main Results:

  • Increasing the number of bosonic reservoirs can induce non-Markovianity, leading to the revival of quantum advantages in teleportation and dense coding.
  • The backflow of information, a signature of non-Markovianity, does not guarantee immediate revivals of quantum advantages.
  • Quantum advantage revivals may be delayed, occurring only after a sufficient accumulation of backflowing information, depending on the initial state.

Conclusions:

  • Non-Markovian dynamics, driven by multi-reservoir interactions, offer a pathway to restore lost quantum communication efficiencies.
  • The timing of quantum advantage recovery is state-dependent and linked to the extent of information backflow.
  • Careful management of environmental interactions and understanding non-Markovian effects are essential for practical quantum communication systems.