Heralded Entanglement of Two Ions in an Optical Cavity
Bernardo Casabone, Andreas Stute, Konstantin Friebe, Birgit Brandstatter, Klemens Schüppert, R. Blatt, Tracy E. Northup · Physical Review Letters · 2013
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.