Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

TT 21.41: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

Giant Atom Coupled to Surface Acoustic Waves — •Lingzhen Guo, Anton Kockum, and Göran Johansson — Department of Microtechnology and Nanoscience, MC2, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden

We investigate the system of an artificial atom (transmon) coupled to surface acoustic waves (SAWs). The artificial atom is giant because the wavelength of SAWs is much smaller than that of light and comparable to the length scale of transmon. We study the situation that the giant atom has two "legs" coupling to SAWs confined in a 1D transmission line. We investigate the parameter regime where the travelling time T of SAWs between the two legs is arbitrary long. We use the time delay differential equations to describe our system and find some new phenomena when the travelling time T is much longer than the atom’s relaxation time, e.g., the decay of the whole system follows a type of polynomial decay instead of exponential decay. We also investigate the transmission properties under driving and find more interesting properties of this system beyond the Markov approximation. The results we get are also true for similar systems implemented in the light cavities and circuit QED.