Coherent Storage of Temporally Multimode Light Using a Spin-Wave Atomic Frequency Comb Memory

TL;DR

This paper demonstrates a coherent, multimode quantum memory for light using an atomic frequency comb scheme in Pr3+:Y2SiO5, capable of storing and recalling five temporal modes with high fidelity.

Contribution

It introduces a full atomic frequency comb scheme for multimode light storage with spin-wave transfer, achieving on-demand recall of multiple temporal modes with high coherence.

Findings

Stored and recalled 5 temporal modes

Achieved over 80% interference visibility

Demonstrated coherence over various storage times

Abstract

We report on coherent and multi-temporal mode storage of light using the full atomic frequency comb memory scheme. The scheme involves the transfer of optical atomic excitations in Pr3+:Y2SiO5 to spin-waves in the hyperfine levels using strong single-frequency transfer pulses. Using this scheme, a total of 5 temporal modes are stored and recalled on-demand from the memory. The coherence of the storage and retrieval is characterized using a time-bin interference measurement resulting in visibilities higher than 80%, independent of the storage time. This coherent and multimode spin-wave memory is promising as a quantum memory for light.