Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Quantum information: Atoms and ions II

Q 24.2: Vortrag

Dienstag, 19. März 2013, 11:30–11:45, A 310

Effects of ion motion in photon-assisted entanglement creation — •Jozsef Zsolt Bernad, Holger Frydrych, and Gernot Alber — Institut für Angewandte Physik, TU Darmstadt, D-64289, Germany

We investigate ion motion as a source of decoherence in the implementation of a hybrid quantum repeater. Studying the dynamics of ion motion in the Lamb-Dicke regime we explore possibilities of entangling two distant material qubits, realized by the internal states of two ions, which interact resonantly with single-mode cavity fields. For the purpose of achieving entangled pairs with high fidelity and with high probability we use an optimal generalized field measurement which is capable of preparing entangled states by postselection. We show that the quality of the entanglement depends primarily on the trap frequency. High trap frequencies enhance the fidelity of the postselected entangled pairs. We also propose a set of dynamical decoupling schemes performed locally on the ions which can suppress ion motion induced decoherence independently from other decoherence sources.