Darmstadt 2008 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 58: Ultrakalte Atome (Einzelne Atome)
Q 58.4: Vortrag
Freitag, 14. März 2008, 12:00–12:15, 3B
Measuring the coupling strength of single atoms to the field of a high-finesse optical resonator — •Sebastian Reick, Wolfgang Alt, Tobias Kampschulte, Mkrtych Khudaverdyan, Karim Lenhard, Karsten Schörner, and Dieter Meschede — Institut für Angewandte Physik, Wegelerstr. 8, -53115 Bonn
The long-term goal of our experiment is the realisation of quantum information processing using neutral atoms. Since they are not coupled to each other or to the environment by a dipole force, which is an advantage in terms of coherence times, coherent interaction of two or more atoms has to be achieved by other means, e.g. by photon exchange.
In our experiment, we store atoms in a standing wave dipole trap, which can be utilised as an optical conveyor belt to move the atoms into the mode of a high-finesse optical resonator. We control the number of atoms loaded into the dipole trap and - with sub-micron precision - the transport distance. We aim at the realisation of coherent interaction between two atoms, placed both at the centre of the cavity field. The calculated parameters of our experimental setup ((gmax,κ,γ) = 2 π (18,0.43,2.61) MHz, g2/(2κ γ )= 146) show that we are in the strong coupling regime.
An important prerequisite for this experiment is the precise knowledge of the coupling strength between one atom and the cavity field g. Furthermore, g should be maximised and kept constant over the interaction time. We report on our results to measure the coupling strength between single atoms and the field of our high-finesse resonator.