Heralded entanglement of two ions in an optical cavity

TL;DR

This paper demonstrates controlled entanglement of two trapped ions via an optical cavity, achieving high fidelity, which advances the development of distributed quantum computing systems.

Contribution

It introduces a method for heralded entanglement of two ions in an optical cavity with high fidelity, a significant step forward in quantum networking.

Findings

Entanglement fidelity of at least 91.9%

Successful generation of ion-ion entanglement

Controlled coupling of ions to an optical cavity

Abstract

We demonstrate precise control of the coupling of each of two trapped ions to the mode of an optical resonator. When both ions are coupled with near-maximum strength, we generate ion--ion entanglement heralded by the detection of two orthogonally polarized cavity photons. The entanglement fidelity with respect to the Bell state $\Psi^+$ reaches $F \geq (91.9\pm2.5)%$. This result represents an important step toward distributed quantum computing with cavities linking remote atom-based registers.