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Updated: Apr 28, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

A millisecond integrated quantum memory for photonic qubits.

Yu-Ping Liu^1,2,3, Zhong-Wen Ou^1,2,3, Tian-Xiang Zhu^1,2,3

¹CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China.

Science Advances

|March 26, 2025

Summary

This summary is machine-generated.

Researchers developed a new integrated quantum memory using a laser-written waveguide in a europium-doped crystal. This quantum memory achieves a record storage time of over 1 millisecond, crucial for quantum networks.

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Last Updated: Apr 28, 2026

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Area of Science:

Quantum Information Science
Optics and Photonics
Materials Science

Background:

Quantum memories are vital for quantum repeaters and networks.
Current integrated quantum memories have limited storage lifetimes (microseconds).
Achieving longer storage times is critical for practical quantum applications.

Purpose of the Study:

To demonstrate a long-lived integrated quantum memory for photonic qubits.
To overcome the limitations of existing integrated quantum storage devices.
To enhance the efficiency and lifetime of quantum memory operations.

Main Methods:

Fabrication of a laser-written optical waveguide in a 151Eu3+:Y2SiO5 crystal.
Implementation of dynamical decoupling via on-chip electric waveguides to mitigate spin dephasing.
Characterization of photonic qubit storage lifetime and efficiency.

Main Results:

Achieved a quantum storage lifetime of 1.021 milliseconds for photonic qubits.
Demonstrated a storage efficiency of 12.0 ± 0.5% at 1.021 ms.
The integrated quantum memory outperformed a simple fiber delay line in efficiency.

Conclusions:

The developed waveguide-based quantum memory offers significantly extended storage times.
This technology is a promising candidate for building practical quantum repeaters.
Further integration with magnetic fields could lead to transportable quantum memories.