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Spontaneous-emission suppression on arbitrary atomic transitions.

Jörg Evers1, Christoph H Keitel

  • 1Theoretische Quantendynamik, Fakultät für Physik, Universität Freiburg, Hermann-Herder-Strasse 3, Germany.

Physical Review Letters
|October 26, 2002
PubMed
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We present a simple method to significantly slow atomic decay using a low-frequency field. This technique controls population trapping duration and amount by enabling new, interfering decay pathways.

Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Laser Spectroscopy

Background:

  • Atomic systems typically exhibit exponential decay of excited state populations.
  • Controlling population dynamics is crucial for applications in quantum information and precision measurements.

Purpose of the Study:

  • To propose and investigate a novel scheme for significantly slowing the decay of an atomic two-level system's upper state population.
  • To explore the role of an additional low-frequency field in modifying population decay dynamics.

Main Methods:

  • Introduction of an intense, low-frequency auxiliary field below the atomic transition's decay width.
  • Analysis of induced additional decay channels involving low-frequency photon exchange.
  • Investigation of quantum interference effects between these new decay pathways.

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Main Results:

  • Demonstration of considerable slowing of the exponential decay of upper state population.
  • Identification of the low-frequency field's intensity and frequency as key control parameters.
  • Quantification of population trapping duration and magnitude modulated by these parameters.

Conclusions:

  • The proposed scheme offers a simple yet effective method for controlling population decay in atomic systems.
  • The ability to tune population trapping via external fields opens possibilities for advanced atomic control.
  • The scheme is readily extendable to atomic systems with multiple lower states.