Efficient Pumping of Spectral Holes in a Tm$^{3+}$: YAG Crystal for Broadband Quantum Optical Storage

TL;DR

This paper demonstrates high-efficiency, broadband quantum memory in a Tm$^{3+}$: YAG crystal at elevated temperatures, using optimized pumping techniques and proposing a general method for large-bandwidth atomic-frequency memory.

Contribution

It introduces a novel pumping approach and a general method for enhancing efficiency and bandwidth in REI-doped crystal quantum memories.

Findings

Storage efficiency >28% at elevated temperatures

High memory bandwidth of 630 MHz achieved

Proposed method enables larger bandwidths in REI-based quantum memories

Abstract

Quantum memory devices with high storage efficiency and bandwidth are essential elements for future quantum networks. Here, we report a storage efficiency greater than 28% in a Tm$^{3+}$: YAG crystal in elevated temperatures and without compromising the memory bandwidth. Using various pumping and optimization techniques, we demonstrate multi-frequency window storage with a high memory bandwidth of 630 MHz. Moreover, we propose a general method for large-bandwidth atomic-frequency memory with non-Kramers rare-earth-ion (REI) in solids enabling significantly higher storage efficiency and bandwidth. Our study advances the practical applications of quantum memory devices based on REI-doped crystals.