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Related Experiment Videos

Decoherence by a chaotic many-spin bath.

J Lages1, V V Dobrovitski, M I Katsnelson

  • 1Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 4, 2005
PubMed
Summary
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Quantum chaos in a many-body spin bath accelerates decoherence of a central two-spin system. Chaotic baths cause faster, stronger decoherence than regular baths, highlighting the importance of bath dynamics beyond basic parameters.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Quantum information science

Background:

  • Decoherence is a critical process in quantum systems, leading to the loss of quantum properties.
  • Understanding decoherence is essential for developing quantum technologies like quantum computing.
  • The dynamics of the environment (bath) significantly influence decoherence rates.

Purpose of the Study:

  • To numerically investigate the effect of quantum chaos in a many-body spin bath on the decoherence of a central two-spin system.
  • To compare decoherence rates and characteristics in chaotic versus regular bath regimes.
  • To determine if basic bath parameters are sufficient to predict decoherence or if finer dynamical details are crucial.

Main Methods:

  • Numerical simulations of a two-spin system interacting with a bath of many spins 1/2.

Related Experiment Videos

  • Systematic variation of bath parameters to transition between quantum chaotic and regular dynamical regimes.
  • Analysis of the central system's density matrix, linear entropy, and fidelity decay.

    • Main Results:

    • The onset of quantum chaos in the bath leads to significantly faster and stronger decoherence of the central system.
    • Decoherence rates and decay patterns (density matrix elements, linear entropy, fidelity) differ markedly between chaotic and non-chaotic baths.
    • The study demonstrates that basic system-bath interaction parameters are insufficient to fully characterize decoherence.

    Conclusions:

    • Quantum chaos in a many-body bath is a crucial factor that can dramatically enhance decoherence.
    • Finer details of the bath's dynamics, beyond simple interaction strengths and spectral properties, play a significant role in decoherence.
    • These findings have implications for controlling decoherence in quantum systems and designing robust quantum information processing devices.