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TT: Fachverband Tiefe Temperaturen
TT 36: TR: Poster Session
TT 36.27: Poster
Thursday, March 25, 2010, 14:00–18:00, Poster A
Galvanic coupling of two superconducting microwave resonators — Thomas Weissl1, •Elisabeth Hoffmann1, Frank Deppe1, Edwin P. Menzel1, Achim Marx1, Rudolf Gross1, David Zueco2, Georg M. Reuther2, Juan J. Garcia-Ripoll3, and Enrique Solano4 — 1Walther-Meissner-Institut and TU München, Garching, Germany — 2Universität Augsburg, Augsburg, Germany — 3Instituto de Fisica Fundamental, CSIC, Madrid, Spain — 4Universidad del País Vasco-Eurskal Herriko Unibertsitatea, Spain
Thermal entanglement, e.g. in a system of two degenerate coupled superconducting microwave resonators, is achieved just by lowering the temperature below a critical temperature Tc and can be detected via suitable correlation measurements. Tc depends on the coupling strength of the two resonators. To obtain a critical temperature of about 100 mK in an actual experiment, a coupling strength of the order of 1 GHz is required. For superconducting flux quantum circuits, such a large coupling can be realized by making use of the kinetic inductance: the circuits have to be galvanically connected and form a single entity. Nevertheless, the physics can often be described by two separate modes with an enhanced coupling constant. Our experiments show that the mode structure of two coupled superconducting microwave resonators changes discontinuously when connecting them galvanically instead of just placing them very close to each other. This is explained within a simple toy model. This work is supported by the DFG within SFB 631 and NIM.