Tackling the Challenges of Quantum Computing with Trapped Ions - Paul C. Haljan

A system of laser-addressed trapped ions offers not only an attractive platform for quantum computation and simulation but also a highly controllable testbed for fundamental quantum atom optics. Our group has a three-pronged attack aiming to demonstrate the ingredients of scalable quantum computing with cadmium ions - microstructure development for scalable ion trap designs; photon-mediated entanglement together with fast entangling gates; and, finally, high fidelity phonon-mediated entanglement using ultracold ions and spin-dependent optical forces. Recent results will be presented with a focus on our progress towards implementing spin-dependent forces with optical Raman transitions. Highlights include single-ion Schroedinger cat states and our first signals of two-ion spin entanglement.