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Updated: Jun 30, 2025

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Long-lived and Efficient Optomechanical Memory for Light.

Mads Bjerregaard Kristensen1, Nenad Kralj1, Eric C Langman1

  • 1Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark and Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.

Physical Review Letters
|March 22, 2024
PubMed
Summary
This summary is machine-generated.

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Researchers created a new optical memory using optomechanically induced transparency. This system stores light in mechanical vibrations, achieving a 23ms lifetime at room temperature for future quantum networks.

Area of Science:

  • Quantum optics
  • Optomechanics
  • Solid-state physics

Background:

  • Optical quantum memories are crucial for quantum networks.
  • Existing quantum memories face challenges with storage time and efficiency.

Purpose of the Study:

  • To demonstrate a novel light memory based on optomechanically induced transparency.
  • To achieve long storage times for optical information using mechanical resonators.

Main Methods:

  • Utilized optomechanically induced transparency in a soft-clamped mechanical membrane resonator.
  • Operated the system at MHz frequencies and room temperature.

Main Results:

  • Achieved a storage lifetime (T1) of approximately 23 milliseconds for classical coherent pulses.

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  • Demonstrated a retrieval efficiency (η) of around 40% at room temperature.
  • Proposed feasibility of quantum light storage at cryogenic temperatures (10 K).

    • Conclusions:

    • The developed system offers a promising approach for long-lived optical quantum memories.
    • Storing optical information in a phononic mode could be valuable for quantum information processing.
    • Potential applications in emerging quantum networks and communication systems.