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Q: Quantenoptik

Q 7: Quantum Information II

Q 7.4: Talk

Monday, April 2, 2001, 18:15–18:30, Audimax

Quantum Entanglement in an Optical Lattice For Rubidium Atoms — •Thilo Elsässer, Boris Nagorny, and Andreas Hemmerich — Institut für Laserphysik, Universität Hamburg, Jungiusstraße 9, D-20355 Hamburg

Neutral atoms trapped in an optical lattice with a low spontaneous scattering rate are well suited for the implementation of quantum logic processes. Since the interactions between atoms inside the lattice are basically zero, the decoherence time of their quantum states can exceed many seconds. However, for the realization of quantum logic gates an interaction mechanism is needed, which can be obtained by coupling the vibrational motion of the atoms inside a ring resonator. This coupling will be provided by the backaction of the atomic motion on the light field, which is strongly enhanced by recycling the photons in a high finesse cavity.

In our experimental setup Rubidium atoms are collected from a hot vapour by a magneto-optical trap (MOT), which serves as a source for a beam of cold atoms for a second MOT inside an ultrahigh vacuum chamber. From this MOT the atoms will be transferred into a standing wave trap formed by a high-Q ring cavity. This configuration allows for the excitation and detection of collective vibrational modes by Raman pulses to demonstrate the atom-atom coupling.