Stimulated Raman process in a scattering medium in application to quantum memory scheme

TL;DR

This paper analyzes the stimulated Raman process in dense atomic media for quantum memory applications, highlighting its differences from EIT-based schemes and exploring transient dynamics during memory operation.

Contribution

It introduces a detailed comparison of Raman and EIT quantum memory schemes, emphasizing their complementary nature and analyzing transient effects during control pulse switching.

Findings

Raman and EIT schemes are complementary for quantum memory.

Transient processes significantly affect probe pulse dynamics.

The study clarifies physical differences between Raman and EIT protocols.

Abstract

We consider the coherent stimulated Raman process developing in an optically dense disordered atomic medium, which can also incoherently scatter the light over all outward directions. The Raman process is discussed in the context of a quantum memory scheme and we point out the difference in its physical nature from a similar but not identical protocol based on the effect of electromagnetically induced transparency (EIT). We show that the Raman and EIT memory schemes do not compete but complement one another and each of them has certain advantages in the area of its applicability. We include in our consideration an analysis of the transient processes associated with switching the control pulse off or on and follow how they modify the probe pulse dynamics on the retrieval stage of the memory protocol.