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Large efficiency at telecom wavelength for optical quantum memories.

Julián Dajczgewand, Jean-Louis Le Gouët, Anne Louchet-Chauvet

|May 3, 2014

Summary

Researchers adapted the two-pulse photon echo (ROSE) scheme for quantum memory using erbium-doped solids. They achieved 40% retrieval efficiency for weak laser pulses, demonstrating potential for quantum information storage.

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Area of Science:

Quantum information science
Solid-state physics
Photonics

Background:

Quantum memory is crucial for quantum communication and computation.
Photon echo techniques offer a pathway for optical quantum memory.
Previous implementations faced limitations in efficiency and compatibility.

Purpose of the Study:

To adapt the ROSE (Retrieval of Optical Signal Echo) protocol for quantum memory applications.
To investigate the feasibility of using erbium-doped solids for quantum memory.
To optimize retrieval efficiency using specific experimental conditions.

Main Methods:

Implementation of the ROSE protocol in an erbium-doped solid-state material.
Utilizing a weak laser pulse for signal retrieval.

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Careful control of light polarizations, magnetic field, and crystal axes orientations.

Main Results:

Successful implementation of the ROSE protocol in an erbium-doped solid compatible with telecom wavelengths.
Observed a retrieval efficiency of 40% for weak laser pulses.
Demonstrated the importance of specific orientations of polarization, magnetic field, and crystal axes.

Conclusions:

The adapted ROSE protocol is suitable for creating a quantum memory.
Erbium-doped solids are viable candidates for solid-state quantum memory.
Optimized experimental conditions significantly enhance retrieval efficiency.