Volume 89, Number 1, January 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 January 2010|
Dynamical bistability in the driven circuit QED
Physikalisches Institut, Albert-Ludwigs-Universität Freiburg - 79104 Freiburg, Germany, EU
2 Institut für Theoretische Physik, Heinrich-Heine-Universität Düsseldorf - 40225 Düsseldorf, Germany, EU
3 Freiburg Institute for Advanced Studies (FRIAS), Albert-Ludwigs-Universität Freiburg - 79104 Freiburg, Germany, EU
Corresponding author: firstname.lastname@example.org
Accepted: 15 December 2009
We show that the nonlinear response of a driven circuit quantum electrodynamics setup displays antiresonant multiphoton transitions, as recently observed in a transmon qubit device. By including photon leaking, we explain the lineshape by a perturbative and a semiclassical analysis. We derive a bistable semiclassical quasienergy surface whose lowest quasienergy eigenstate is squeezed, allowing to define a squeezing-dependent local effective temperature. We study the escape dynamics out of the metastable state and find signatures of dynamical tunneling, similar as for the quantum Duffing oscillator.
PACS: 78.47.-P – Spectroscopy of solid state dynamics / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 42.50.Pq – Cavity quantum electrodynamics; micromasers
© EPLA, 2010
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