Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 42: Quantum Coherence, Quantum Information Systems 2

TT 42.14: Talk

Wednesday, March 13, 2013, 19:00–19:15, H18

Engineered circuit QED with dense resonant modes — •Daniel Egger and Frank Wilhelm — Universität des Saarlandes, Saarbrücken, Germany

Meta-materials are systems engineered at a wavelength smaller than the radiation considered but larger than the atomic scale; they gain their properties from their structure. Of notable interest are left-handed meta-materials. They exhibit negative permittivity and permeability[1]. On chip quantum optics routinely use right-handed transmission lines, made of a microwave strip-line, as information mediators[2]. In this work, we discuss the properties of a left-handed/right-handed hybrid transmission line. The resulting mode structure presents a mode pile-up at a lower cut-off frequency. Placing a qubit near the hybrid line results in strong to ultra-strong coupling to a quasi-continuum of modes. This system generates strongly entangled multi-mode states and also serves as quantum simulator for a spin-boson model with a sub-sub-ohmic density of states.
[1] V. Veselago, Sov. Phys. Usp. 10, 517 (1968)
[2] A. Blais et al., PRA 69 062320 (2004)