Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Photonik 3

Q 58.5: Talk

Friday, March 16, 2012, 11:45–12:00, V38.01

Entanglement generation by resonant photon exchange in a hybrid quantum repeater — •Joszef Bernad and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289 Darmstadt

The realization of a quantum repeater capable of creating entanglement between qubits over large distances still represents a major quantum technological challenge. In this context the recent proposal of van Loock et al. [1] of a hybrid quantum repeater in which continuous variables of the electromagnetic field exchange quantum information with spatially separated material qubits offers interesting perspectives for preparing highly entangled material qubit pairs over large distances.

In this contribution we extend this proposal of van Loock et al. to cases in which the interaction between the material qubits and the photons is resonant but sufficiently short so that effects of spontaneous decay can be neglected. It is demonstrated that this way the probability of creation of high-fidelity Bell-states between the two spatially separated atomic qubits can be increased in comparison with the off-resonant cases considered so far [1]. Results on maximum achievable success probabilities of creating high-fidelity Bell pairs are presented. Furthermore, also effects originating from loss in the connecting optical fiber are discussed.

[1] P. van Loock, T.D. Ladd, K. Sanaka, F. Yamagouchi, , K. Nemoto, W. J. Munro, and Y. Yamamoto, Phys. Rev. Lett. 96, 240501 (2006).