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Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Quantum memory in warm rubidium vapor with buffer gas.

Mark Bashkansky1, Fredrik K Fatemi, Igor Vurgaftman

  • 1Naval Research Laboratory, Optical Sciences Division, Washington, DC 20375, USA. bashkansky@nrl.navy.mil

Optics Letters
|August 3, 2012
PubMed
Summary
This summary is machine-generated.

Quantum memory was successfully demonstrated in a single warm atomic vapor cell using a nearly copropagating beam geometry. This method achieves quantum correlations characteristic of quantum states for up to 4 μs delay times.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Quantum information science

Background:

  • Quantum memory is crucial for quantum information processing.
  • Warm atomic vapor cells offer potential for practical quantum memory due to commercial availability and reduced complexity.
  • Previous studies reported ambiguous results for quantum memory in such systems.

Purpose of the Study:

  • To demonstrate the feasibility of quantum memory in a single warm atomic vapor cell.
  • To investigate the effectiveness of a nearly copropagating write and read beam geometry.
  • To characterize the quantum correlations of emitted photons.

Main Methods:

  • Utilized a single warm atomic vapor cell containing buffer gas.
  • Employed a nearly copropagating geometry for write and read laser beams.
  • Measured photon cross-correlation functions.

Main Results:

  • Achieved quantum memory implementation in the specified setup.
  • Observed photon cross-correlation values greater than 2, indicating quantum states.
  • Maintained these quantum correlations for delay times up to 4 microseconds.

Conclusions:

  • Quantum memory is achievable in a single warm atomic vapor cell with buffer gas using a copropagating beam configuration.
  • The demonstrated method provides a viable pathway for developing practical quantum memory devices.
  • The results overcome previous ambiguities and highlight the potential of this approach.