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External time-varying fields and electron coherence.

Jen-Tsung Hsiang1, L H Ford

  • 1Institute of Cosmology, Department of Physics and Astronomy, Tufts University, Medford, MA 02155, USA. jen-tsung.hsiang@tufts.edu

Physical Review Letters
|July 13, 2004
PubMed
Summary
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Time-varying electromagnetic fields cause electron decoherence by altering the Aharonov-Bohm phase. This loss of electron coherence, observed as reduced contrast in interference patterns, is potentially measurable.

Area of Science:

  • Quantum mechanics
  • Electromagnetism
  • Condensed matter physics

Background:

  • Electron coherence is fundamental to quantum phenomena.
  • Aharonov-Bohm phase effects arise from electromagnetic potentials.
  • Decoherence limits quantum system performance.

Purpose of the Study:

  • Investigate the impact of time-varying electromagnetic fields on electron coherence.
  • Quantify the decoherence effect induced by these fields.
  • Assess the observability of this decoherence phenomenon.

Main Methods:

  • Theoretical analysis of electron behavior in time-varying electromagnetic fields.
  • Calculation of the Aharonov-Bohm phase accumulation.
  • Modeling the effect on quantum interference patterns.

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Main Results:

  • Sinusoidal electromagnetic fields induce a time-varying Aharonov-Bohm phase.
  • Averaging over this phase leads to a loss of contrast in interference patterns, signifying decoherence.
  • Calculated decoherence magnitude is significant across various field configurations.

Conclusions:

  • Time-varying electromagnetic fields are a source of electron decoherence.
  • The predicted decoherence effect is substantial enough for experimental observation.
  • Understanding this effect is crucial for quantum technologies.