Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: SC: Tunnelling, Josephson Junctions

TT 31.13: Talk

Thursday, March 25, 2010, 12:45–13:00, H21

Dynamical bistability in driven Josephson circuits - the WKB limit and beyond. — •Vittorio Peano and Michael Thorwart — FRIAS Albert-Ludwigs-Universität, Freiburg, Deutschland

Driven and dissipative nonlinear quantum oscillators can be operated in a regime where a bistability is induced dynamically. Prominent examples are the Josephson bifurcation amplifier and the driven circuit QED set-up of the superconducting transmon qubit. Josephson circuits with their large quality factors and scalable nonlinearities are the perfect playground to explore this phenomenon from the classical limit down to the quantum scale. We show that the WKB approximation is an excellent tool in all these regimes. We explore its limit of validity, focusing thereby on the quantum Duffing oscillator and the driven circuit QED.