Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster 2

Q 35.25: Poster

Wednesday, March 14, 2012, 16:30–19:00, Poster.I+II

Towards Photons storage in a small atomic ensemble — •Sutapa Ghosh, Miguel Martinez-Dorantes, Jose Gallego, Natalie Thau, Seokchan Yoon, Marcel Spurny, Wolfgang Alt, and Dieter Meschede — Institut für Angewandte Physik, Universität Bonn, Bonn, Deutschland

Single photons can be collectively absorbed by large ensembles of atoms creating spin-wave states. Stokes and anti-Stokes photons can be used to write and read quantum information even if some atoms have decohered. Thus we can transform photonic information into stationary qubits. To achieve the required strong coupling of light with an atom we can introduce it in an ultra high finesse optical resonator. To avoid losses and stabilization issues, one can use small atomic ensembles in medium finesse cavities. Recently a novel type of optical fiber based Fabry-Perot cavities with high finesse has been realized [1]. These cavities allow miniaturization (improving stability) and reduce coupling losses. In this work we present our first design for an experimental setup involving optical fiber based Fabry-Perot cavities. A small atomic ensemble can be loaded in a 3D lattice inside the cavity creating a strong atomic localization and avoiding motional dephasing. This lattice will be implemented using two crossed standing wave dipole traps, together with an intra-cavity lock laser standing wave. Short focal length aspheric lenses will be used for focusing these dipole traps and a large numerical aperture lens will allow an efficient fluorescence collection.

[1] D Hunger, T Steinmetz , Y Colombe , C Deutsch , T W Hänsch and J Reichel, 2010 New J. Phys. 12 065038