Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 103: Transport: Poster Session

TT 103.27: Poster

Thursday, March 19, 2015, 15:00–18:00, Poster B

Tunable Nb resonators for resonant coupling with ultracold atomic gases — •Benedikt Ferdinand, Daniel Bothner, Dominik Wiedmaier, Dieter Koelle, and Reinhold Kleiner — Physikalisches Institut and Center for Collective Quantum Phenomena in LISA⁺, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

We intend to investigate a hybrid quantum system where ultracold atomic gases play the role of a long-living quantum memory, coupled to a superconducting qubit via a transmission line resonator. As a first step towards this goal we develop a tunable superconducting resonator-chip containing a Z-shaped trapping wire for the atoms. Schemes for trapping the atoms in close vicinity of the resonator gap for maximum coupling are presented. We forthermore show how one can retain the full microwave performance despite these additional wire structures. For resonant coupling it is beneficial to have a tunable resonator which is insensitive to applied magnetic fields. Therefore we add a ferroelectric tunable capacitance with small dimensions compared to the resonator length. Experimental results of the controlled tunability are shown.