A number of techniques exist to use an ensemble of atoms as a quantum memory for light. Many of these propose to use backward retrieval as a way to improve the storage and recall efficiency. We report on a demonstration of an off-resonant Raman memory that uses backward retrieval to achieve an efficiency of 65±6% at a storage time of one pulse duration. The memory has a characteristic decay time of 60 μs, corresponding to a delay-bandwidth product of 160.
@article{arxiv.1805.01080,
title = {High-performance Raman memory with spatio-temporal reversal},
author = {Pierre Vernaz-Gris and Aaron D. Tranter and Jesse L. Everett and Anthony C. Leung and Karun V. Paul and Geoff T. Campbell and Ping Koy Lam and Ben C. Buchler},
journal= {arXiv preprint arXiv:1805.01080},
year = {2018}
}