Conversion and storage of modes with orbital angular momentum in quantum memory scheme

TL;DR

This paper explores the use of Raman quantum memory protocols to store and manipulate quantum light with orbital angular momentum in cold atomic ensembles, demonstrating efficiency and transformation capabilities.

Contribution

It introduces a method for storing and transforming orbital angular momentum in quantum memory using a three-level atomic ensemble with a plane wave driving field.

Findings

Storage/retrieval efficiency comparable to spatial multimode protocols

Effective transformation of orbital angular momentum in quantum memory

Analysis confirms feasibility of quantum light with orbital momentum storage

Abstract

The paper studies the Raman quantum memory protocol as applied to quantum light with orbital angular momentum. The memory protocol is implemented on an ensemble of three-level cold atoms with the $\Lambda$- configuration of energy levels. The possibility of storing quantum statistics of light with an orbital momentum is analysed in the case when the driving field could be treated as a plane wave. The efficiency analysis shows that examined storage/retrieval processes do not cause the efficiency decreasing compared with the spatial multimode memory protocol considered in [Golubeva et al. 2012]]. We also present an effective transformation of the orbital angular momentum of a quantum field on a memory cell using the driving field with orbital angular momentum.