Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 55: Ultra-cold atoms, ions and BEC VII (with A)
Q 55.3: Vortrag
Donnerstag, 21. März 2013, 14:30–14:45, B 305
Atomic Coherence in a Superconducting Coplanar Resonator — •Patrizia Weiß, Helge Hattermann, Simon Bernon, Daniel Bothner, Martin Knufinke, Reinhold Kleiner, Dieter Koelle, and József Fortágh — Physikalisches Institut and CQ Center for Collective Quantum Phenomena and their Applications, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
Superconducting devices have proved suitable for fast qubit operations and quantum gates. However, their coherence times are still limited to a few µs. Therefore hybrid quantum systems have attracted considerable interest. One promising system is composed of superconductors and cold atoms, in which the atomic ensemble takes the role of a quantum memory and is coupled to a superconducting resonator that acts as a quantum bus.
Here we report on the preparation and coherence times of atomic ensembles in a superconducting coplanar resonator on an atom chip. The superconducting structures are based on niobium thin films at 4.2 K. Atoms are trapped by persistent currents in the resonator ground planes. We are able to produce large BECs of up to 106 atoms. The coherence of atomic superposition states is investigated by means of Ramsey interferometry. We find atomic coherence times on the order of T2 ∼ 10 s. We report on progress towards coupling of the atoms to the mode of a cavity.