Quantum Information with Atoms and Light- Given by Steven Olmschenk

Fri, Feb 4, 2011, 1:30 pm to 3:00 pm
Location: 
Jadwin 303
Abstract: Rapid progress in coherent control of single trapped atomic ions and ensembles of ultracold atoms in optical lattices has enabled more precise atomic physics measurements, a probe of fundamental quantum physics, and progress towards quantum information processing. Here I present recent results on approaches to quantum information with each of these systems. Using ytterbium ions coupled to single photons, we demonstrate a quantum teleportation protocol between two distant matter qubits with a measured fidelity of 90(2)%. With atoms in an optical lattice, we perform randomized benchmarking of single qubit operations, measuring an average error per gate of 1.4(1) x 10^-4. A method to extend the coherence time by cancellation of up to 95(2)% of the differential light shift in the ground state of rubidium is also implemented. Finally, I discuss how these gate operations might be extended for more advanced applications.