We report the first 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.
@article{arxiv.2605.11786,
title = {Realization of Backward Retrieval in a Stark-modulated Spin-wave Quantum Memory},
author = {Zhenqi Xu and Mucheng Guo and Weiye Sun and Pengjun Liang and Zongquan Zhou and Fudong Wang and Shuping Liu and Manjin Zhong},
journal= {arXiv preprint arXiv:2605.11786},
year = {2026}
}