Ion Photon Entanglement with Barium

Abstract

Entanglement between a single trapped <super>138</super>Ba<super>+</super> and a single spontaneously emitted photon is demonstrated. The system is used to measure a CHSH Bell signal of 2.303(36), verifying the violation of the CHSH inequality by over eight standard deviations. The feasibility of using the system to perform a loophole free measurement of the violation of the Bell inequality is considered. A pair of side projects are discussed. First, the robustness of adiabatic rapid passage in the presence of noise in the driving field is investigated. And second, a ppm measurement of the Land´e g factor of the 5D_5/2 level of <super>138</super>Ba<super>+</super> is reported. The new ion trap that made all this work possible is introduced.