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Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

High-capacity spatial multimode quantum memories based on atomic ensembles.

Anna Grodecka-Grad¹, Emil Zeuthen, Anders S Sørensen

¹QUANTOP, Danish National Research Foundation Center for Quantum Optics, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark. anna.grodecka-grad@nbi.dk

Physical Review Letters

|October 4, 2012

Summary

We demonstrate highly efficient storage of multiple spatial modes using quantum memories with Λ-type atoms. These quantum light-matter interfaces show excellent scalability for multimode quantum memories.

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Area of Science:

Quantum information science
Atomic physics
Quantum optics

Background:

Quantum memories are essential for quantum information processing.
Storing multiple spatial modes in quantum memories is a significant challenge.
Previous approaches have limitations in scalability and efficiency.

Purpose of the Study:

To investigate spatial multimode quantum memories based on light storage in Λ-type atomic ensembles.
To demonstrate highly efficient storage of numerous spatial modes.
To analyze the scalability of such quantum light-matter interfaces.

Main Methods:

Utilizing extended ensembles of Λ-type atoms for light storage.
Implementing forward operating quantum memories.
Analyzing the scaling properties with Fresnel number and optical depth.

Main Results:

Achieved highly efficient storage of many spatial modes.
Demonstrated quadratic scaling with the Fresnel number.
Showcased cubic scaling with the optical depth of the atomic ensemble.

Conclusions:

Spatial multimode quantum memories based on Λ-type atoms offer high efficiency.
The longitudinal and transverse shapes of spin wave modes are a valuable resource.
This approach provides a promising avenue for scalable multimode quantum memories.