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Decoherence via the dynamical casimir effect

Dalvit1, Maia Neto PA

  • 1T-6, Theoretical Division, MS B288, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|October 4, 2000
PubMed
Summary
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The dynamical Casimir effect causes quantum superposition states to lose coherence rapidly. This decoherence time depends on the state's "macroscopicity," with coherent states emerging as preferred outcomes.

Area of Science:

  • Quantum optics
  • Quantum thermodynamics
  • Condensed matter physics

Background:

  • The interaction between macroscopic objects and quantum fields is a key area in quantum physics.
  • Understanding decoherence mechanisms is crucial for quantum information processing and fundamental physics.

Purpose of the Study:

  • To derive a master equation describing a mirror interacting with the vacuum field through radiation pressure.
  • To investigate the role of the dynamical Casimir effect in the decoherence of superposition states.

Main Methods:

  • Derivation of a master equation for a mirror-vacuum field interaction.
  • Analysis of the time scale for decoherence based on the
  • macroscopicity
  • of quantum states.

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Main Results:

  • The dynamical Casimir effect induces decoherence in superposition states.
  • Decoherence time scales can be significantly shorter than relaxation times.
  • Coherent states are identified as pointer states selected by the interaction.

Conclusions:

  • The radiation pressure interaction with the vacuum field provides a mechanism for rapid decoherence.
  • The
  • macroscopicity
  • of quantum states dictates the speed of decoherence.
  • Coherent states play a special role as stable states in this open quantum system.