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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Sudden transition between classical and quantum decoherence.

L Mazzola1, J Piilo, S Maniscalco

  • 1Turku Centre for Quantum Physics, Department of Physics and Astronomy, University of Turku, FI-20014 Turun yliopisto, Finland. laura.mazzola@utu.fi

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Quantum discord, a measure of quantum correlations, resists decoherence initially. Classical correlations decay first, followed by quantum correlations, marking a transition in open system dynamics.

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Area of Science:

  • Quantum Information Science
  • Quantum Dynamics
  • Open Quantum Systems

Background:

  • Quantum and classical correlations are fundamental to quantum information processing.
  • Decoherence, the interaction with the environment, typically destroys quantum correlations.
  • Understanding correlation dynamics under decoherence is crucial for quantum technologies.

Purpose of the Study:

  • To investigate the dynamics of quantum and classical correlations under nondissipative decoherence.
  • To identify initial states where quantum correlations are robust against decoherence.
  • To characterize the transition in open system dynamics from classical to quantum decoherence regimes.

Main Methods:

  • Analysis of quantum discord as a quantifier for quantum correlations.
  • Study of system dynamics in the presence of nondissipative decoherence.
  • Examination of correlation evolution over time for specific initial states.

Main Results:

  • Discovery of initial states where quantum discord remains unaffected by decoherence for initial time intervals (t < τ).
  • Observation of classical correlations decaying during this initial phase (t < τ).
  • Identification of a transition time (τ) where classical correlations stabilize and quantum correlations degrade due to environmental interaction.

Conclusions:

  • Nondissipative decoherence can preserve quantum correlations for specific initial states over certain time scales.
  • Open quantum systems exhibit a distinct transition from classical to quantum decoherence dynamics at a critical time.
  • The findings offer insights into protecting quantum information from environmental noise.