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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Spin-Wave Multiplexed Atom-Cavity Electrodynamics.

Kevin C Cox1, David H Meyer1, Zachary A Castillo1,2

  • 1U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, USA.

Physical Review Letters
|January 18, 2020
PubMed
Summary
This summary is machine-generated.

We demonstrate multiplexed atom-cavity quantum electrodynamics using spin waves in an atomic ensemble coupled to a single optical cavity. This enables selective control and interference for quantum information processing applications.

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Area of Science:

  • Quantum Information Science
  • Atomic, Molecular, and Optical Physics

Background:

  • Atom-cavity quantum electrodynamics is a fundamental platform for quantum information processing.
  • Controlling interactions between multiple quantum systems within a cavity is crucial for advanced applications.

Purpose of the Study:

  • To introduce and experimentally demonstrate multiplexed atom-cavity quantum electrodynamics.
  • To enable selective coupling and interference of multiple spin-wave excitations within a single cavity mode.

Main Methods:

  • Utilizing multiple Raman dressing beams to create distinct spatial profiles of cavity-coupled spin-wave excitations.
  • Experimentally observing phenomena such as vacuum Rabi splittings and selective superradiance.
  • Investigating cavity-mediated interactions between two spin waves.

Main Results:

  • Demonstrated selective superradiance and interference in cavity-mediated spin-wave interactions.
  • Achieved rapid, interchangeable cavity coupling to 4 distinct spin-wave profiles with low overlap (<10%).
  • Showcased potential for quantum repeater network simulation.

Conclusions:

  • The developed multiplexing technique allows for controlled interactions of multiple spin waves in a single cavity.
  • The platform shows promise for scalable quantum information processing, with potential for >10^3 profiles.