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Realization of backward retrieval in a Stark-modulated spin-wave quantum memory

Zhenqi Xu1,2, Mucheng Guo1,2, Weiye Sun1,2, Pengjun Liang3,4,5,6, Zongquan Zhou3,4,5,6, Fudong Wang2,*, Shuping Liu2,†, and Manjin Zhong2,‡

  • *Contact author: fdwang.phys@foxmail.com
  • †Contact author: liushuping@iqasz.cn
  • ‡Contact author: manjin.zhong@gmail.com
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Phys. Rev. A 114, 032616 – Published 22 September, 2026

DOI: https://doi.org/10.1103/j9v5-fsbc

Abstract

We report an experimental realization of backward retrieval in a spin-wave quantum memory based on a Stark-echo-modulated protocol in Eu3+:Y2SiO5. By using Stark control, we preserve the full optical depth of the ensemble while suppressing coherent noise, enabling conditional storage fidelities above 97%. Our analysis shows that the present backward-retrieval efficiency is mainly limited by technical imperfections rather than by fundamental constraints. With realistic engineering improvements, backward retrieval in this protocol could move beyond the reabsorption-limited forward-emission regime. The protocol is also compatible with cavity-enhanced operation, offering an additional route toward higher efficiencies. These findings establish Stark-echo modulation as a practical and scalable route to high-efficiency, long-lived solid-state quantum memories.

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Phys. Rev. A 114, 032616– Published 22 September, 2026
  • Received 24 November 2025
  • Accepted 23 July 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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