Enhanced Quantum Interface with Collective Ion-Cavity Coupling

TL;DR

This paper demonstrates control over collective ion-cavity interactions by preparing entangled states, enabling tunable emission properties and improved quantum information transfer in a cavity QED system.

Contribution

It introduces a method to tune ion-cavity coupling from sub- to superradiance using entangled states, enhancing quantum information transfer.

Findings

Controlled transition from sub- to superradiance

Enhanced quantum information transfer using entangled states

Demonstration of tunable ion-cavity coupling

Abstract

We prepare a maximally entangled state of two ions and couple both ions to the mode of an optical cavity. The phase of the entangled state determines the collective interaction of the ions with the cavity mode, that is, whether the emission of a single photon into the cavity is suppressed or enhanced. By adjusting this phase, we tune the ion--cavity system from sub- to superradiance. We then encode a single qubit in the two-ion superradiant state and show that this encoding enhances the transfer of quantum information onto a photon.