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 Ψ+ reaches F≥(91.9±2.5). This result represents an important step toward distributed quantum computing with cavities linking remote atom-based registers.
@article{arxiv.1308.3126,
title = {Heralded entanglement of two ions in an optical cavity},
author = {B. Casabone and A. Stute and K. Friebe and B. Brandstätter and K. Schüppert and R. Blatt and T. E. Northup},
journal= {arXiv preprint arXiv:1308.3126},
year = {2015}
}