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From single- to multiple-pPhoton decoherence in an atom interferometer.

D A Kokorowski1, A D Cronin, T D Roberts

  • 1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|April 6, 2001
PubMed
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We measured how spontaneous photon scattering causes decoherence in separated atomic superpositions. Increased scattered photons qualitatively changed decoherence, confirming models for various decoherence phenomena.

Area of Science:

  • Quantum physics
  • Atomic physics
  • Quantum optics

Background:

  • Atomic superposition states are fundamental in quantum mechanics.
  • Decoherence, the loss of quantum properties, is a major challenge in quantum technologies.
  • Spontaneous photon scattering is a key mechanism causing decoherence.

Purpose of the Study:

  • To measure the decoherence of spatially separated atomic superpositions.
  • To investigate the effect of spontaneous photon scattering on decoherence.
  • To compare experimental results with general decoherence models.

Main Methods:

  • Creating spatially separated atomic superposition states.
  • Measuring decoherence by monitoring the loss of quantum coherence.
  • Analyzing the decoherence rate as a function of separation and scattered photon number.

Related Experiment Videos

Main Results:

  • Observed a qualitative change in decoherence with increasing separation and scattered photons.
  • Quantitatively verified the decoherence rate constant in the many-photon limit.
  • Demonstrated an evolution of decoherence consistent with established theoretical models.

Conclusions:

  • Spontaneous photon scattering significantly impacts atomic superposition decoherence.
  • The study provides quantitative data validating decoherence models.
  • Results contribute to understanding and mitigating decoherence in quantum systems.