Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster Session Transport & Matter at Low Temperature
TT 58.28: Poster
Thursday, March 14, 2013, 15:00–19:00, Poster D
From strong to ultrastrong coupling in Circuit QED — •A. Baust1,2, T. Losinger2, M. Haeberlein1,2, E. Hoffmann1,2, P. Eder1,2, J. Goetz1,2, F. Loacker2, E.P. Menzel1,2, M.J. Schwarz1,2, F. Wulschner1,2, L. Zhong1,2, F. Deppe1,2, H. Huebl1,2, A. Marx1,2, and R. Gross1,2 — 1Walther-Meißner-Institut, Germany — 2TU München, Garching
In circuit quantum electrodynamics, the light-matter coupling strength can be tuned over several orders of magnitude and can even be increased to a significant fraction of the system energy. For a flux qubit coupled to a transmission line resonator, we have reached the regime of ultrastrong light-matter interaction and show experimental evidence for the breakdown of the Jaynes-Cummings-model [1]. We present spectroscopic measurements for different coupling schemes of flux qubits and transmission line resonators and discuss the possibility to further increase the coupling strength and reach the regime of deep-ultrastrong coupling. For a complete characterization of our qubits we also perform time-domain spectroscopy measurements in order to determine the coherence times of our qubits.
This work is supported by DFG via SFB 631, the German Excellence Initiative via NIM, as well as EU projects CCQED and PROMISCE.
[1] T. Niemczyk et al., Nature Phys. 6, 772-776 (2010)