Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 75: Poster Quanteninformation

Q 75.12: Poster

Thursday, March 16, 2006, 16:30–18:30, Labsaal

Manipulating individual neutral atoms deterministically loaded into a standing wave optical dipole trap using a feedback loop — •Sebastian Reick, Wolfgang Alt, Igor Dotsenko, Leonid Förster, Mkrtych Khudaverdyan, Dieter Meschede, Yevhen Miroshnychenko, Dominik Schrader, and Arno Rauschenbeutel — Institut für angewandte Physik, Wegelerstr. 8, 53115 Bonn

Neutral atoms trapped in light induced potentials are a promising candidate for quantum information processing. We have demonstrated that a string of single caesium atoms trapped in an optical dipole trap (DT) can serve as a quantum register. To realize two-qubit operations we aim to use atom-atom interactions enhanced by the exchange of a photon inside a high-finesse optical resonator. In order to place two atoms into the fundamental mode of our cavity it is essential to accurately control the absolute position and the distance between atoms.

We move the atoms by means of our No-dqconveyor beltNo-dq technique. Using optical tweezers we extract atoms out of a string and reinsert them at a predetermined position, thereby precisely controlling the interatomic distances. Using this method we prepare regular strings of up to seven atoms.

For our experiments it is desirable to work with a predetermined number of atoms. Therefore we developed a loading feedback to circumvent the Poission-statistical limit of the MOT loading process. The efficiency of this feedback is enhanced by collisional re-distribution of atoms during loading the DT which allows us to load up to 20 atoms into the DT.