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Electro-optic quantum memory for light using two-level atoms.

G Hétet1, J J Longdell, A L Alexander

  • 1ARC COE for Quantum-Atom Optics, Australian National University, Canberra, ACT 0200, Australia.

Physical Review Letters
|February 1, 2008
PubMed
Summary
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We developed a quantum memory using two-level atoms to store light fields, inspired by NMR gradient echo. This efficient method achieves up to 26% recall efficiency in solid-state experiments.

Area of Science:

  • Quantum physics
  • Atomic physics
  • Optics

Background:

  • Quantum memory is crucial for quantum information processing.
  • Storing light fields in atomic ensembles is a promising approach.
  • Existing methods face limitations in efficiency and scalability.

Purpose of the Study:

  • To present a novel quantum memory scheme for light field storage.
  • To demonstrate the scheme's efficiency and forward emission properties.
  • To analyze and experimentally validate the proposed protocol.

Main Methods:

  • Utilizing an ensemble of two-level atoms as the storage medium.
  • Employing a technique analogous to Nuclear Magnetic Resonance (NMR) gradient echo.
  • Controlling a linearly varying broadening for imprinting and recalling the light field.

Related Experiment Videos

Main Results:

  • The protocol achieves perfect efficiency in the high optical depth limit.
  • Experimental results in a solid-state system show up to 15% total efficiency.
  • A recall efficiency of 26% was experimentally demonstrated.

Conclusions:

  • The proposed quantum memory scheme is simple and efficient.
  • Experimental validation confirms the theoretical model's predictions.
  • Future improvements could surpass the no-cloning limit for quantum information transfer.