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Electromagnetically induced quantum memory.

A Nazarkin1, R Netz, R Sauerbrey

  • 1Friedrich-Schiller-Universität, Institut für Optik und Quantenelektronik, Max-Wien-Platz 1, D-07743 Jena, Germany. nazarkin@ioq.uni-jena.de

Physical Review Letters
|March 6, 2004
PubMed
Summary
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We demonstrate a method to preserve quantum coherence in optically driven systems by forming a "dark state" using an additional laser field. This technique suppresses decoherence, enabling long-lived Rabi oscillations and coherent propagation phenomena.

Area of Science:

  • Quantum optics
  • Quantum information science
  • Atomic, molecular, and optical physics

Background:

  • Decoherence in optically driven quantum systems is a major obstacle for quantum technologies.
  • Laser fields can induce decoherence by coupling quantum systems to decaying states or continua.

Purpose of the Study:

  • To investigate methods for creating and preserving coherence in optically driven quantum systems.
  • To explore the suppression of decoherence caused by laser fields themselves.

Main Methods:

  • Applying an additional laser field to create a "dark state".
  • Analyzing systems with level splitting or degeneracy where the driving field interacts with multiple sublevels.
  • Investigating interference suppression of decoherence.

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Main Results:

  • Suppression of relaxation channels through "dark state" formation.
  • Observation of long-lived Rabi oscillations.
  • Coherent propagation phenomena assisted by interference suppression of decoherence.

Conclusions:

  • The proposed method effectively preserves quantum coherence in optically driven systems.
  • The "dark state" mechanism is applicable to systems with level splitting or degeneracy.
  • Coherent phenomena can be achieved by actively suppressing decoherence.