Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 5: Transport: Quantum Coherence and Quantum Information Systems - Experiment
TT 5.2: Talk
Monday, March 31, 2014, 09:45–10:00, HSZ 204
Tunable coupling between two superconducting microwave resonators — •Friedrich Wulschner1, Jan Goetz1, Borja Peropadre3, Alexander Baust1, Elisabeth Hoffmann1,2, David Zueco4, Frank Deppe1,2, Edwin P. Menzel1, Achim Marx1, Juan Jose Garcia-Ripoll3, and Rudolf Gross1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, TU München, Garching, Germany — 3IFF-CSIC, Madrid, Spain — 4CSIC-Universidad de Zaragoza and Fundacion ARAID, Spain
In the field of superconducting quantum circuits, experiments with a small number of qubits and/or resonators have been successfully performed to realize proof-of-principle quantum information architectures. For scaling up such systems, it is desirable to achieve controllable couplings between individual circuit elements. In our experiment, we demonstrate a tunable coupling between two transmission line resonators via an RF-SQUID. The RF-SQUID can be considered as a tunable mutual inductance which can change both sign and magnitude. We show spectroscopic data of the tunable coupler and explain the magnetic flux dependence of the coupling with a theoretical model.
We acknowledge support from the DFG via SFB 631, the German excellence initiative via NIM, and the EU via PROMISCE.