Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.45: Poster

Monday, March 26, 2012, 15:00–19:00, Poster B

Compact superconducting coplanar microwave beam splitters — •Alexander Baust^1,2, Norbert Kalb², Max Haeberlein^1,2, Jan Goetz^1,2, Elisabeth Hoffmann^1,2, Edwin P. Menzel^1,2, Manuel J. Schwarz^1,2, Friedrich Wulschner^1,2, Ling Zhong^1,2, Thomas Losinger², Frank Deppe^1,2, Achim Marx^1,2, and Rudolf Gross^1,2 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Physik-Department, TUM, Garching, Germany

The recent evolution of circuit quantum electrodynamics systems making use of standing-wave microwave modes towards setups for propagating quantum microwaves has triggered the need for low-loss superconducting microwave beam splitters. Such a device should have ports compatible with the coplanar geometry relevant for circuit QED and, at the same time, be compact allowing for scalability. This combination presents fundamental and technological challenges. In this work, we present the fabrication and characterization of various compact superconducting coplanar microwave beam splitters. In addition, we discuss efforts towards a tunable beam splitter.

This work is supported by the DFG via SFB631 and by the German Excellence Initiative via NIM.