Optical memory bandwidth and multiplexing capacity in the erbium telecommunication window

TL;DR

This paper analyzes the bandwidth and multiplexing capacity of erbium-doped optical memories in the telecom window, focusing on the ROSE protocol and how to mitigate spectral diffusion to optimize quantum storage performance.

Contribution

It provides a detailed analysis of the limitations imposed by spectral diffusion on erbium-based quantum memories and strategies to minimize these effects for improved capacity.

Findings

Spectral diffusion limits memory bandwidth and capacity.

Minimizing spectral diffusion enhances quantum memory performance.

ROSE protocol offers high multiplexing potential in erbium-doped memories.

Abstract

We study the bandwidth and multiplexing capacity of an erbium-doped optical memory for quantum storage purposes. We concentrate on the protocol ROSE (Revival of a Silenced Echo) because it has the largest potential multiplexing capacity. Our analysis is applicable to other protocols that involve strong optical excitation. We show that the memory performance is limited by instantaneous spectral diffusion and we describe how this effect can be minimised to achieve optimal performance.