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Related Experiment Video

Updated: May 1, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 12, 2013

A single-atom quantum memory.

Holger P Specht¹, Christian Nölleke, Andreas Reiserer

¹Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.

|May 3, 2011

Summary

This summary is machine-generated.

Researchers developed a single-atom quantum memory for storing light qubits. This breakthrough enables more reliable quantum communication and computing by faithfully storing quantum states with high fidelity and long coherence times.

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Area of Science:

Quantum Information Science
Atomic Physics
Quantum Optics

Background:

Faithful storage of quantum bits (qubits) of light is crucial for quantum communication, networking, and computing.
Existing quantum memories often use ensembles of particles, limiting individual control and error correction.

Purpose of the Study:

To demonstrate a single-particle approach to quantum memory using a single atom.
To enable heralding mechanisms and in situ processing for improved quantum information storage and manipulation.

Main Methods:

Mapping arbitrary polarization states of light into and out of a single atom trapped in an optical cavity.
Utilizing weak coherent pulses and full quantum process tomography for performance analysis.

Main Results:

Achieved an average fidelity of 93% for storing and retrieving quantum states.
Demonstrated qubit coherence times exceeding 180 microseconds due to low decoherence rates.

Conclusions:

The single-atom quantum memory represents a fundamental advancement in quantum memory technology.
This system offers a versatile quantum node with significant potential for optical quantum gates and quantum repeaters.