Stuttgart 2012 – wissenschaftliches Programm
Q 34.48: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.I+II
State preparation of cold cesium atoms in a nanofiber-based two-color dipole trap — •Rudolf Mitsch, Daniel Reitz, Philipp Schneeweiss, and Arno Rauschenbeutel — VCQ, TU Wien – Atominstitut, Stadionallee 2, A-1020 Wien
We have recently demonstrated a new experimental platform for trapping and optically interfacing laser-cooled cesium atoms. The scheme uses a two-color evanescent field surrounding an optical nanofiber to localize the atoms in a one-dimensional optical lattice 200 nm above the nanofiber surface [1, 2]. In order to use this fiber-coupled ensemble of trapped atoms for applications in the context of quantum communication and quantum information processing, an initialization of the atoms in a well defined quantum state has to be realized. In free-beam dipole traps, such a state preparation is usually achieved by means of optical pumping. However, the nanofiber guided fields exhibit a complex polarization pattern which hampers the implementation of standard optical pumping schemes based on, e.g., the interaction of the atoms with circularly polarized light. Here, we show that optical pumping of the atoms using fiber guided light fields is possible in spite of this fact.
Financial support by the Volkswagen Foundation, the ESF and the FWF (CoQuS graduate school) is gratefully acknowledged.
 E. Vetsch et al., Phys. Rev. Lett. 104, 203603 (2010).
 S. T. Dawkins et al., Phys. Rev. Lett. 107, 243601 (2011).