Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.66: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Coherence properties of cold cesium atomic spins in a nanofiber-based dipole trap — •Rudolf Mitsch, Daniel Reitz, Clément Sayrin, Philipp Schneeweiss, and Arno Rauschenbeutel — Vienna Center for Quantum Science and Technology, TU Wien, Atominstitut, Stadionallee 2, 1020 Wien, Austria
The possibility to efficiently store quantum information over extended periods of time is a prerequisite for quantum protocols. Here, we present the first experimental characterization of the coherence properties of nanofiber-trapped atoms. In our system, neutral Cs atoms are trapped in a two-color evanescent field surrounding a subwavelength-diameter optical fiber. The atoms are localized in an one-dimensional optical lattice only 200 nm above the dielectric surface [1]. This close proximity and the strong polarization gradients of nanofiber-guided light fields are prone to cause decoherence. In order to investigate these effects, a resonant microwave field is used to drive the mF=0 → 0 clock-transition between the two hyperfine ground states. Ramsey interferometry on this transition yields inhomogeneous dephasing times of about T2*=500 µs, whereas spin echo measurements result in homogeneous dephasing times of up to T2′=2 ms. These long coherence times are compatible with the implementation of more complex quantum operations, thereby paving the road towards establishing nanofiber-based traps for cold atoms as a building block in a quantum network.
[1] E. Vetsch et al., Phys. Rev. Lett. 104, 203603 (2010).