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TT: Fachverband Tiefe Temperaturen

TT 5: Transport: Quantum Coherence and Quantum Information Systems - Experiment

TT 5.2: Vortrag

Montag, 31. März 2014, 09:45–10:00, HSZ 204

Tunable coupling between two superconducting microwave resonators — •Friedrich Wulschner¹, Jan Goetz¹, Borja Peropadre³, Alexander Baust¹, Elisabeth Hoffmann^1,2, David Zueco⁴, Frank Deppe^1,2, Edwin P. Menzel¹, Achim Marx¹, Juan Jose Garcia-Ripoll³, and Rudolf Gross^1,2 — 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.