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Quantifying Early Time Quantum Decoherence Dynamics through Fluctuations.

Bing Gu1, Ignacio Franco1

  • 1Department of Chemistry and ‡Department of Physics, University of Rochester , Rochester, New York 14627, United States.

The Journal of Physical Chemistry Letters
|August 22, 2017
PubMed
Summary
This summary is machine-generated.

We found a simple way to predict quantum decoherence time by looking at initial operator fluctuations. This method simplifies studying open quantum systems and testing quantum dynamics approximations for molecular processes.

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Area of Science:

  • Quantum mechanics
  • Chemical physics
  • Condensed matter theory

Background:

  • Decoherence is a key process in open quantum systems, limiting quantum behavior.
  • Understanding decoherence dynamics is crucial for quantum computing and molecular processes.
  • Current methods for analyzing decoherence can be computationally intensive.

Purpose of the Study:

  • To establish a general relation between operator fluctuations and quantum coherence loss timescale.
  • To provide a method for predicting and measuring early-time decoherence dynamics in open quantum systems.
  • To offer a platform for testing approximate quantum dynamics methods.

Main Methods:

  • Developed a simple relation linking coherence loss timescale to initial operator fluctuations.
  • Applied the relation to calculate decoherence times for standard models (Holstein, spin-boson, Caldeira-Legget).
  • Evaluated the performance of mixed quantum-classical schemes (e.g., Ehrenfest dynamics) using Wigner distribution sampling.

Main Results:

  • The proposed relation accurately predicts decoherence timescales for various quantum systems.
  • Purity can be used to measure decoherence without reconstructing the full density matrix.
  • Mixed quantum-classical methods, when initialized with Wigner distribution, capture short-time decoherence.

Conclusions:

  • The new relation offers a practical approach to determine decoherence times in molecular systems.
  • This work provides a benchmark for assessing the accuracy of approximate quantum dynamics simulations.
  • Advances facilitate the development of decoherence-aware simulations for complex molecular processes.