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Q: Quantenoptik

Q 9: Poster: Quantum Information

Q 9.8: Poster

Tuesday, April 3, 2001, 12:30–15:00, AT2

Dissipation-assisted adiabatic passage into an entangled state — •Almut Beige and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching

We propose a new scheme to entangle two spatially separated atoms in a dissipative environment in a controlled way. To do so, the atoms are moved slowly in and out of an optical cavity. In addition, only a single laser is required which does not need to address each atom separately.

The scheme is based on the existence of dark states in which the atoms do not interact with the cavity mode and which can correspond to highly entangled atomic states. Initially in a dark state, the atoms remain always decoupled from the cavity mode. The system follows the dark state adiabatically which changes in the same way as the system parameters do.

A high decay rate of photons inside the cavity mode can improve the fidelity of the prepared state. Deviations from the dark state are then damped away during the no-photon time evolution of the system. Another advantage of our scheme is that spontaneous emission by the atoms is highly reduced and that it is stable against fluctuations of most system parameters.