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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Information: Atoms and Ions I

Q 17.5: Vortrag

Dienstag, 9. März 2010, 15:30–15:45, E 214

Multipartite W states for chains of atoms conveyed through an optical cavity — •Denis Gonta¹ and Stephan Fritzsche^2,3 — ¹Max-Planck-Institut für Kernphysik, Postfach 103980, D-69029 Heidelberg — ²Department of Physical Sciences, P.O Box 3000, Fin-9014, University of Oulu, Finland — ³GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt

Optical cavities provide a perspective tool to produce the interaction between neutral atoms which are coupled simultaneously to the same cavity mode. An excellent control of the atomic motion is essential for such interaction and can be realized especially by using optical lattices (conveyor belts), which have recently been utilized in various setups of cavity QED. The combination of such a lattice with the cavity QED setup, however, make it necessary to analyze how the velocity and the spacing between the atoms in the chain will affect the formation of entanglement.

In this contribution, we propose a scheme to generate the entangled W_N state between the qubits associated with N three-level atoms in the Λ-type configuration. The atoms are supposed to be equally separated from each other and conveyed through the cavity by means of an optical lattice. This scheme works in a completely deterministic way and is robust with respect to small oscillations in the atomic motion as caused by the thermal motion of atoms in the optical lattice [1].

[1] D. Gonta and S. Fritzsche, J. Phys. B 42, 145508 (2009).