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Decoherence due to elastic Rayleigh scattering.

H Uys1, M J Biercuk, A P Vandevender

  • 1National Institute of Standards and Technology, Boulder, Colorado 80305, USA. huys@csir.co.za

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Elastic Rayleigh scattering can dominate decoherence in quantum systems, even when scattering rates are equal. This study reveals constructive interference effects impacting hyperfine ground-state superpositions in beryllium ions.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Hyperfine ground-state superpositions are crucial for quantum information processing.
  • Decoherence, particularly from light scattering, poses a significant challenge to maintaining quantum states.
  • Previous literature often underestimated the role of elastic Rayleigh scattering in decoherence.

Purpose of the Study:

  • To investigate the decoherence of hyperfine ground-state superpositions caused by elastic Rayleigh scattering.
  • To demonstrate that elastic Rayleigh scattering can be the primary source of decoherence under specific conditions.
  • To theoretically and experimentally validate the decoherence rate formula for two-level systems.

Main Methods:

  • Theoretical modeling of decoherence rates due to elastic Rayleigh scattering.
  • Experimental measurements of decoherence rates in a 9Be+ ion system.
  • Utilizing a 4.5 Tesla magnetic field to isolate valence electron spin levels.

Main Results:

  • Elastic Rayleigh scattering can be the dominant decoherence mechanism, contradicting prior assumptions.
  • The decoherence rate is proportional to the square of the difference in elastic-scattering amplitudes between the two levels.
  • Constructive interference of scattering amplitudes can occur even with equal scattering rates, depending on light detuning.

Conclusions:

  • Elastic Rayleigh scattering is a critical factor in the decoherence of quantum states.
  • Understanding and controlling this scattering mechanism is essential for advancing quantum technologies.
  • The findings provide a more accurate model for decoherence in relevant quantum systems.