Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.74: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

A single atom in a 3D optical lattice strongly coupled to an optical cavity — •Stephan Ritter, Andreas Reiserer, Christian Nölleke, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany

Single atoms in optical cavities have proven ideal for the reversible interconversion and storage of quantum information and therefore make excellent quantum network nodes. Despite these successes, position and momentum of the atom has so far escaped complete control. As a consequence, the atom-cavity coupling strength is neither maximal nor constant. This limits the fidelity and in particular the efficiency of interconversion and other quantum information processing protocols. To solve this problem, we demonstrate deterministic localization of a single atom in a three-dimensional optical lattice with the resonator as one of the lattice axes. By shifting the standing-wave potential formed by one of the lattice beams, we place the atom at the center of the cavity mode. This allows us to reach the strong-coupling regime of cavity QED manifested by a clearly resolved normal-mode splitting even for a moderate cavity finesse. The use of high intensities along all three axes gives adjustable trap frequencies of a few hundred kHz, such that the atom is tightly confined to the Lamb-Dicke regime. This enables Raman sideband cooling to the ground state of the three-dimensional lattice potential.