Trapped atomic ions are a leading platform for quantum information networks, with long-lived identical qubit memories that can be locally entangled through their Coulomb interaction and remotely entangled through photonic channels. However, performing both local and remote operations in a single node of a quantum network requires extreme isolation between spectator qubit memories and qubits associated with the photonic interface. We achieve this isolation and demonstrate the ingredients of a scalable ion trap network node by co-trapping 171Yb+ and 138Ba+ qubits, entangling the mixed species qubit pair through their collective motion, and entangling the 138Ba+ qubits with emitted visible photons.
@article{arxiv.1702.01062,
title = {Multi-Species Trapped Ion Node for Quantum Networking},
author = {I. V. Inlek and C. Crocker and M. Lichtman and K. Sosnova and C. Monroe},
journal= {arXiv preprint arXiv:1702.01062},
year = {2017}
}