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This summary is machine-generated.

This study explores quantum entanglement in two-qubit systems interacting with complex environments. Findings reveal that environmental conditions can suppress entanglement but enhance nonlocality, impacting quantum correlations.

Keywords:
decoherencedisentanglementopen quantum system

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Condensed Matter Physics

Background:

  • Understanding quantum entanglement dynamics is crucial for quantum information processing.
  • Non-Markovian environments and nonstationary noise pose significant challenges to maintaining quantum correlations.
  • The interplay between entanglement and nonlocality in realistic quantum systems requires further theoretical investigation.

Purpose of the Study:

  • To theoretically investigate the non-Markovian disentanglement dynamics of a two-qubit system.
  • To analyze the influence of nonequilibrium environments with random telegraph noise on entanglement and nonlocality.
  • To establish relationships between entanglement, nonlocality, and decoherence functions under specific initial states.

Main Methods:

  • Utilized the Kraus representation for the reduced density matrix of the two-qubit system.
  • Derived analytical relations connecting entanglement (concurrence) and nonlocality with the decoherence function.
  • Identified threshold values of the decoherence function for the persistence of entanglement and nonlocality.

Main Results:

  • Environmental nonequilibrium suppresses disentanglement dynamics and reduces entanglement revivals in non-Markovian regimes.
  • The nonequilibrium nature of the environment enhances the nonlocality of the two-qubit system.
  • Entanglement sudden death/rebirth and transitions between quantum and classical nonlocality are sensitive to initial state and environmental parameters.

Conclusions:

  • Nonequilibrium environments offer a route to enhance nonlocality, despite their detrimental effects on entanglement.
  • The study provides critical insights into controlling quantum correlations in realistic, noisy quantum systems.
  • Findings are relevant for designing robust quantum technologies operating in complex environments.