High-performance Raman memory with spatio-temporal reversal

TL;DR

This paper demonstrates a high-efficiency off-resonant Raman quantum memory using backward retrieval, achieving 65% efficiency with a 60 microsecond decay time, advancing quantum light storage capabilities.

Contribution

It introduces a Raman memory with backward retrieval that significantly improves efficiency and storage time compared to previous methods.

Findings

Achieved 65% storage and retrieval efficiency.

Memory decay time of 60 microseconds.

Delay-bandwidth product of 160.

Abstract

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 $65\pm6\%$ at a storage time of one pulse duration. The memory has a characteristic decay time of 60 $\mu$s, corresponding to a delay-bandwidth product of $160$.