Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: TR: Quantum Coherence and Quantum Information Systems 1 (jointly with MA and HL)
TT 30.8: Vortrag
Mittwoch, 16. März 2011, 12:30–12:45, HSZ 03
Towards ultrastrong coupling of superconducting transmission line resonators — •Frank Deppe1,2, Thomas Weissl1,2, Elisabeth Hoffmann1,2, Max Haeberlein1,2, Alexander Baust1,2, Jan Goetz2, Manuel J. Schwarz1, Thomas Niemczyk1, Edwin P. Menzel1, Achim Marx1, David Zueco3, Juan-Jose Garcia Ripoll4, and Rudolf Gross1,2 — 1Walther-Meissner-Institut, Garching, Germany — 2TU Muenchen, Garching, Germany — 3CSIC-Universidad de Zaragoza, Zaragoza, Spain — 4Institutio de Fisica Fundamental, CSIC, Madrid, Spain
Coupled superconducting transmission line resonator systems have potential applications in quantum information processing and fundamental quantum mechanics. Experimentally, high coupling strengths are desirable for a clear demonstration of quantum effects. We achieve coupling strengths of more than 10% of the resonator frequency (ultrastrong coupling) by distributed coupling. We find that, differently from the case of point-like coupling, the normal modes are no longer arranged symmetrically with respect to the single resonator frequency. Nevertheless, a detailed theoretical analysis shows that the system can still be described by a beam splitter Hamiltonian for two effective resonators. We expect that this result will allow for straightforward experimental access to exciting effects such as thermal entanglement in our samples.
This work is supported by the Deutsche Forschungsgemeinschaft via SFB 631, the German Excellence Initiative via NIM, FIS2008-01240, and FIS2009-13364-C02-0 (MICINN).