We report on the implementation of a high fidelity universal gate-set on optical qubits based on trapped 88Sr+ ions for the purpose of quantum information processing. All coherent operations were performed using a narrow linewidth diode laser. We employed a master-slave configuration for the laser, where an ultra low expansion glass (ULE) Fabry-Perot cavity is used as a stable reference as well as a spectral filter. We characterized the laser spectrum using the ions with a modified Ramsey sequence which eliminated the affect of the magnetic field noise. We demonstrated high fidelity single qubit gates with individual addressing, based on inhomogeneous micromotion, on a two-ion chain as well as the M{\o}lmer-S{\o}rensen two-qubit entangling gate.
@article{arxiv.1505.02503,
title = {Universal gate-set for trapped-ion qubits using a narrow linewidth diode laser},
author = {Nitzan Akerman and Nir Navon and Shlomi Kotler and Yinnon Glickman and Roee Ozeri},
journal= {arXiv preprint arXiv:1505.02503},
year = {2015}
}