High speed spatially multimode Lambda-type atomic memory with arbitrary frequency detuning

TL;DR

This paper introduces a comprehensive model for a high-speed, spatially and temporally multimode atomic memory capable of storing quantum light pulses with arbitrary frequency detuning, optimizing efficiency across various conditions.

Contribution

It provides a general, detailed theoretical framework for Lambda-type atomic memories that handle multimode storage with arbitrary detuning, including optimization strategies.

Findings

Model covers resonant to Raman regimes.

Enables optimization of memory efficiency.

Supports spatial and temporal multimode storage.

Abstract

We present a general model for an atomic memory using ultra-short pulses of light, which allows both spatial and temporal multimode storage. The process involves the storage of a faint quantum light pulse into the spin coherence of the ground state of Lambda-type 3-level atoms, in the presence of a strong driving pulse. Our model gives a full description of the evolution of the field and of the atomic coherence in space and time throughout the writing and the read-out processes. It is valid for any frequency detuning, from the resonant case to the Raman case, and allows a detailed optimization of the memory efficiency.