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Related Experiment Videos

Entangled and disentangled evolution for a single atom in a driven cavity.

J Gea-Banacloche1, T C Burt, P R Rice

  • 1Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.

Physical Review Letters
|March 24, 2005
PubMed
Summary

Special initial states in driven atom-cavity systems enable near-disentangled evolution. Superpositions create entanglement, with spontaneous emission transiently boosting it beyond steady-state levels for tracking.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Cavity quantum electrodynamics

Background:

  • Understanding atom-field interactions in driven cavities is crucial for quantum information processing.
  • Entanglement dynamics in open quantum systems are complex and depend heavily on initial conditions and dissipation.

Purpose of the Study:

  • To investigate the creation and evolution of entanglement in a driven atom-cavity system.
  • To explore the role of spontaneous emission on entanglement dynamics.
  • To identify experimental methods for monitoring entanglement evolution.

Main Methods:

  • Theoretical analysis of an atom in an externally driven cavity.
  • Investigation of specific initial quantum states and their superpositions.
  • Modeling the effects of spontaneous emission on the atom-field system.

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Main Results:

  • Identified initial states leading to near-disentangled atom-field evolution.
  • Demonstrated that superpositions of these states can generate near-maximally entangled states.
  • Observed a transient increase in entanglement due to spontaneous emission, exceeding steady-state values.
  • Proposed a field correlation function for experimental tracking of entanglement.

Conclusions:

  • Tailored initial states are key to controlling entanglement in driven atom-cavity systems.
  • Spontaneous emission, while typically a source of decoherence, can transiently enhance entanglement in this specific setup.
  • The proposed correlation function offers a viable experimental probe for real-time entanglement monitoring.