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Dephasing Dynamics in a Non-Equilibrium Fluctuating Environment.

Xiangjia Meng1,2, Yaxin Sun3, Qinglong Wang3

  • 1School of Information Engineering, Shandong Youth University of Political Science, Jinan 250103, China.

Entropy (Basel, Switzerland)
|May 16, 2023
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Summary
This summary is machine-generated.

We studied quantum dephasing in fluctuating environments using generalized random telegraph noise. Environmental memory modulation can control quantum system dephasing and Markovian-non-Markovian transitions.

Keywords:
decoherencenon-equilibrium environmental fluctuationsopen quantum systems

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Area of Science:

  • Quantum physics
  • Quantum information science
  • Theoretical chemistry

Background:

  • Quantum systems are susceptible to environmental noise, leading to decoherence.
  • Non-equilibrium and non-Markovian environments pose significant challenges for quantum state preservation.
  • Understanding dephasing dynamics is crucial for quantum technologies.

Purpose of the Study:

  • To theoretically investigate the dephasing dynamics of a quantum two-state system.
  • To analyze the influence of a generalized random telegraph noise (RTN) model for non-equilibrium environments.
  • To explore the role of environmental memory modulation on decoherence.

Main Methods:

  • Developed a theoretical framework using a generalized random telegraph noise (RTN) process.
  • Employed master equations for multi-time probability distributions.
  • Derived the decoherence factor via a closed fourth-order differential equation.
  • Analyzed dephasing in four distinct dynamics regimes.

Main Results:

  • The decoherence factor was exactly derived for a generalized RTN with a modulatable memory kernel.
  • Special cases recovered previously known decoherence factor expressions.
  • Environmental memory modulation was shown to effectively influence dynamical dephasing.
  • The conversion between Markovian and non-Markovian dephasing dynamics can be controlled.

Conclusions:

  • Generalized RTN provides a suitable model for non-equilibrium fluctuating environments.
  • Environmental memory kernels offer a mechanism to control quantum dephasing.
  • The findings are relevant for mitigating decoherence in quantum systems and devices.