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A solid-state light-matter interface at the single-photon level.

Hugues de Riedmatten1, Mikael Afzelius, Matthias U Staudt

  • 1Group of Applied Physics, University of Geneva, CH-1211 Geneva 4, Switzerland. hugues.deriedmatten@unige.ch

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|December 17, 2008
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Summary
This summary is machine-generated.

Researchers demonstrate a new method for quantum information transfer using solid-state atomic ensembles. This breakthrough enables coherent mapping of light fields onto matter, paving the way for advanced quantum networks and solid-state quantum memories.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Quantum Optics

Background:

  • Coherent quantum information transfer between light and matter is crucial for quantum networks and repeaters.
  • Existing quantum interfaces rely on atomic gases or single trapped atoms.
  • A solid-state approach offers potential advantages for scalability and integration.

Purpose of the Study:

  • To demonstrate coherent and reversible mapping of light fields onto a solid-state atomic ensemble.
  • To investigate the feasibility of solid-state quantum memories for quantum information storage.
  • To explore the potential of solid-state systems as an alternative to atomic gases for quantum interfaces.

Main Methods:

  • Utilizing an ensemble of approximately 10^7 atoms naturally trapped in a solid.
  • Coherent absorption of weak light fields (less than one photon per pulse) into the atomic medium.
  • Storing the quantum state as collective atomic excitations for up to 1 microsecond.
  • Releasing the stored light field in a well-defined spatio-temporal mode via collective interference.

Main Results:

  • Achieved coherent and reversible mapping of single-photon-level light fields onto a solid-state atomic ensemble.
  • Verified high coherence of the mapping process with interference experiments yielding visibilities over 95%.
  • Demonstrated the capability to store and retrieve light fields in multiple temporal modes.

Conclusions:

  • The study presents a novel solid-state quantum interface for light-matter information transfer.
  • The demonstrated high coherence and multi-mode storage capabilities make solid-state quantum memories a promising alternative to atomic gases.
  • This work advances the development of quantum networks and quantum repeaters.