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Chaos in circuit QED: decoherence, localization and nonclassicality
Stockholm University, Faculty of Science, Department of Physics. University of Cologne, Germany.
2013 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 46, no 22, 224015- p.Article in journal (Refereed) Published
Abstract [en]

We study the open system dynamics of a circuit quantum electrodynamics (QED) model operating in the ultrastrong coupling regime. If the resonator is pumped periodically in time the underlying classical system is chaotic. Indeed, the periodically driven Jaynes-Cummings model in the Born-Oppenheimer approximation resembles a Duffing oscillator which in the classical limit is a well-known example of a chaotic system. Detection of the field quadrature of the output field acts as an effective position measurement of the oscillator. We address how such detection affects the quantum chaotic evolution in this bipartite system. We differentiate between single measurement realizations and ensembles of repeated measurements. In the former case a measurement/decoherence induced localization effect is encountered, while in the latter this localization is almost completely absent. This is in marked contrast to numerous earlier works discussing the quantum-classical correspondence in measured chaotic systems. This lack of a classical correspondence under relatively strong measurement induced decoherence is attributed to the inherent quantum nature of the qubit subsystem and in particular to the quantum correlations between the qubit and the field which persist despite the decoherence.

Place, publisher, year, edition, pages
2013. Vol. 46, no 22, 224015- p.
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-97647DOI: 10.1088/0953-4075/46/22/224015ISI: 000326925600017OAI: diva2:680589


Available from: 2013-12-18 Created: 2013-12-16 Last updated: 2013-12-18Bibliographically approved

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