Poster 19

Shoupu Wan UT-Physics

Entanglement Generation and Quantum computing in Ultra-cold 87Rb atomic gases in Optical Lattices As a pure quantum mechanical phenomenon, entanglement is fundamental to the study of the underlying principles of quantum mechanics and provides the basis for many applications in quantum simulation, quantum computationand information processing. Realization of entanglement in real physical systems requires precise control of the time-dependent Hamiltonian and a high degree of coherence of operations. Achieving these conditions is extremely demanding.The realization of Bose-Einstein condensation in dilute neutral atomic gases hasopened new possibilities for physics experiments in many fields. The predicted quantum phase transition from a superfluid to a Mott insulator in Bose-Hubbard model has been achieved with ultra-cold neutral atoms confined in far-detuned optical lattices. What’s more, state-selective optical lattices enableone to translate atoms in different internal states relative to each other as if they are riding in two oppositely running trains. It is possible to experimentally generate entangled atom pairs and even large-scale entanglement of multi-particle systems in optical lattices using several of these techniques. We propose to produce and to study entangled 87Rb atom pairs and entangled multi-particle states in optical lattices. With an 87Rb atomic Bose-Einstein condensate as the starting point, we can prepare atoms in the Mott insulator phase with twoatoms per site. These atom pairs will be converted to entangled ones using stimulated Raman transitions between two internal atomic states assisted by collisional energy level shifts. What’s more, we could utilize the state-selective transport to bring atoms on neighboring sites into contact and follow similar stimulated Raman sequences as above to produce entangled multi-particle states. After having successfully achieved these goals, we will study the kinds of entangled statesthat can be stably generated and the kinds of probes that are sensitive to this entanglement. These experiments may have direct applications in fields suchas quantum simulation, quantum computation and information processing.