Spectroscopic properties of inhomogeneously broadened spin ensembles in a cavity

TL;DR

This paper investigates how the inhomogeneous broadening of spin ensembles affects their collective interaction with a cavity mode, with implications for quantum information storage and processing.

Contribution

It provides a detailed analysis of the influence of broadening width and shape on collective enhancement and system dynamics in cavity-spin ensembles.

Findings

Broadening shape significantly impacts collective coupling strength.

Inhomogeneous broadening can limit quantum state storage fidelity.

Optimal broadening parameters enhance quantum information applications.

Abstract

In large ensembles of identical atoms or spins, the interaction with a mode of the electromagnetic radiation field concentrates in a single superradiant degree of freedom with a collectively enhanced coupling. Given a controllable inhomogeneous broadening, such ensembles may be used for multi-mode storage of quantum states of the radiation field with applications in quantum communication networks and quantum computers. In this paper we analyze how the width and shape of the inhomogeneous broadening influence the collective enhancement and the dynamics of the cavity-ensemble system with focus on the consequences for the ensemble's applicability for quantum information processing tasks.