Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 36: Ultra-cold atoms, ions and BEC IV (with Q)

A 36.1: Talk

Thursday, March 20, 2014, 10:30–10:45, BEBEL E34

Manipulation and Coherence of Ultracold Atoms in Superconducting Coplanar Resonator — •Helge Hattermann, Simon Bernon, Patrizia Weiß, Martin Knufinke, Daniel Bothner, Matthias Rudolph, 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 circuits in the microwave regime are promising candidates for quantum information processing. However, their coherence times are still limited to 100 µs. A possible solution is to create a hybrid quantum system, in which the quantum information is processed by superconducting circuits and the information is coherently transferred and stored in a second quantum system. Due to their long coherence times, ultracold atoms coupled to a superconducting resonator are suitable for such a quantum memory.

Here we report on the preparation and coherence of atomic ensembles in a superconducting coplanar resonator on an atom chip based on niobium thin films at 4.2 K. Atoms are trapped by persistent currents in the resonator ground planes. The coherence of atomic superposition states is investigated by means of Ramsey interferometry. We find atomic coherence times on the order of several seconds. We report on progress towards coupling of the atoms to the mode of a cavity.

S. Bernon et. al., Nat. Commun. 4, 2380 (2013)