Realization of Backward Retrieval in a Stark-modulated Spin-wave Quantum Memory

TL;DR

This paper demonstrates the first experimental backward retrieval in a Stark-modulated spin-wave quantum memory, achieving high fidelity and highlighting potential for efficiency improvements.

Contribution

It presents the first experimental realization of backward retrieval in a Stark-echo-modulated quantum memory, showing its practical scalability and potential for higher efficiency.

Findings

Achieved conditional storage fidelities above 97%

Backward retrieval efficiency limited mainly by technical imperfections

Potential for surpassing reabsorption-limited forward-emission with improvements

Abstract

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.