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A: Fachverband Atomphysik

A 9: Ultra-Cold Atoms, Ions and BEC II (with Q)

A 9.8: Vortrag

Mittwoch, 10. März 2010, 12:15–12:30, F 303

Cold atoms near superconductors — •Helge Hattermann, Florian Jessen, Brian Kasch, Daniel Cano, Max Kahmann, Dieter Koelle, Reinhold Kleiner, and József Fortágh — Physikalisches Institut, Eberhard-Karls-Universität Tübingen, CQ Center for Collective Quantum Phenomena and their Applications, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

We report on the measurement of atomic spin coherence near the surface of a superconducting niobium wire. As compared to normal conducting metal surfaces, the atomic spin coherence is maintained for time periods beyond the Johnson noise limit. The result provides experimental evidence that magnetic near field noise is strongly suppressed close to the superconductor. For very small distances to the wire surface, the magnetic field exclusion due to the Meissner effect reduces the trap depth and leads to atom losses. Based on our results, we discuss possibilities to circumvent these detrimental losses and to coherently couple ultracold atoms to solid state devices, opening the way towards the construction of hybrid quantum systems.