Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Quantum Coherence, Quantum Information Systems 2
TT 42.6: Vortrag
Mittwoch, 13. März 2013, 16:15–16:30, H18
Fast microwave beam splitters from superconducting resonators — •M. Haeberlein1,2, D. Zueco3, P. Assum2, T. Weißl4, E. Hoffmann1,2, B. Peropadre5, J.J. García-Ripoll5, E. Solano6, F. Deppe1,2, E. Xie1,2, A. Marx1, and R. Gross1,2 — 1Walther-Meißner-Institut, Garching, Germany — 2Technische Universität München, Garching, Germany — 3CSIC-Universidad de Zaragoza, Spain — 4CNRS, Grenoble, France — 5CSIC-Instituto de Física Fundamental, Madrid, Spain — 6Universidad del País Vasco and IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
Coupled superconducting transmission line resonators have potential applications in quantum information processing. Experimentally, high coupling strength are often desirable. One example is the fabrication of fast beam splitters, which however is hampered by non-negligible two-mode squeezer terms. In this work, we experimentally study superconducting microstrip resonators which are coupled over one third of their length. We alter position of this coupling region, thereby changing the relative weight between inductive and capacitive coupling. As a consequence, the beam splitter terms reach a coupling strength of 800 MHz, which is a significant fraction of the resonance frequency of 5.44 GHz. Nevertheless, the relative weight of the two-mode squeezer terms decreases to 20%, enabling the construction of a fast beam splitter.
This work is supported by DFG via SFB 631, the German excellence Initiative via NIM, EU projects SOLID; CCQED, and PROMISCE, Basque Government IT472-10, Spanish MICINN FIS2009-12773-C02-01, and DZ granted by ARAID.