Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.21: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Circuit QED with hybrid metamaterial transmission lines — •Stefan Ruloff, Bruno Taketani, and Frank Wilhelm — Theoretical Physics, Universität des Saarlandes, Saarbrücken, Germany

We’re working on the theory of metamaterials providing some interesting results. The negative refraction index causes an opposite orientation of the wave vector k and the Poynting vector S of the travelling waves. Hence the metamaterial has a falling dispersion relation ∂ ω(k)/∂ k < 0 implying that low frequencies correspond to short wavelengths. Metamaterials are simulated by left-handed transmission lines consisting of discrete arrays of series capacitors and parallel inductors to ground [1]. Unusual physics arises when right-and left-handed transmission lines are coupled forming a hybrid metamaterial transmission line [2]. E.g. if a qubit is placed in front of a hybrid metamaterial transmission line terminated in an open circuit, the spontaneous emission rate is weakened or unaffected depending on the transition frequency of the qubit. Some other research interests are the general analysis of metamaterial cavities and the mode structure of hybrid metamaterial cavities for QND readout of multi-qubit operators [3]. Especially the precise answer to the question about the definition of the mode volume of a metamaterial cavity is one of our primary goals.
G. Eleftheriades, A. Iyer & P. Kremer,

IEEE Trans. Microw. Theory Tech. 50, 2702 (2002)
D.J. Egger and F.K. Wilhelm, PRL 111, 163601 (2013)
L. C. G. Govia et al., Phys. Rev. A 92, 022335 (2015).