Berlin 2005 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Tiefe Temperaturen

TT 13: Transport - Quantum Coherence and Quantum Information Systems

TT 13.9: Vortrag

Samstag, 5. März 2005, 11:00–11:15, TU H3027

Multiphoton antiresonance and Rabi oscillations of ac driven quantum oscillators — •M. V. Fistul¹ and M. I. Dykman² — ¹Theoretische Physik III, Ruhr-Universität Bochum — ²Department of Physics and Astronomy, Michigan State University, East Lansing, USA

We report a theoretical analysis of coherent multiphoton quantum transitions of ac driven nonlinear oscillators. We show that these transitions are accompanied by a novel effect, an antiresonance of the response. The nonlinear response of a quantum oscillator displays antiresonant dips and resonant peaks with varying frequency of the driving field. The effect is a consequence of special symmetry and is related to resonant multiphoton mixing of several pairs of oscillator states at a time. The shape and magnitude of the dips (peaks) strongly depend on the field. We calculate the multiphoton Rabi frequency and discuss the possibility to observe the antiresonance and the associated multiphoton Rabi oscillations in various mesoscopic systems, e.g. Josephson junctions, nanomechanical resonators and molecular magnets. The role of a specific source of decoherence, i.e. a low frequency noise is discussed.