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TT: Fachverband Tiefe Temperaturen
TT 44: Transport: Quantum Coherence and Quantum Information
TT 44.11: Vortrag
Donnerstag, 26. März 2009, 17:00–17:15, HSZ 304
Driving-induced bistability in the Jaynes-Cummings model — •Vittorio Peano1, Vicente Leyton Ortega2, and Michael Thorwart3,1 — 1Universität Düsseldorf — 2Universidad del Valle, Cali (Colombia) — 3FRIAS, Universität Freiburg
As a consequence of nonlinearity and external driving, the generalized Jaynes-Cummings model exhibits a dynamical bistability. This can be conveniently investigated by introducing a quasipotential in phase space. We study the dissipative dynamics in this bistable quasipotential by means of a simple Markovian master equation and we interpret the results in terms of a quasiclassical analysis. We prove the existence of a metastable squeezed amplitude state and find resonant and antiresonant behavior of the lineshape in correspondence to multiphoton transitions. They are due to a sizeable occupation of the metastable state. We discuss similarities to the quantum Duffing oscillator [1] and also explain the lineshape of the recently observed vacuum Rabi supersplittings [2] in the superconducting transmon qubit set-up.
[1] V. Peano and M. Thorwart, New J. Phys. 8, 21 (2006). [2] Lev S. Bishop, J. M. Chow, Jens Koch, A. A. Houck, M. H. Devoret, E. Thuneberg, S. M. Girvin, R. J. Schoelkopf, arXiv:0807.2882.