Universität zu Köln

Larson, Jonas and O'Dell, Duncan H. J. (2013). Chaos in circuit QED: decoherence, localization and nonclassicality. J. Phys. B-At. Mol. Opt. Phys., 46 (22). BRISTOL: IOP PUBLISHING LTD. ISSN 1361-6455

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Larson, Jonas UNSPECIFIED UNSPECIFIED UNSPECIFIED O'Dell, Duncan H. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-471763
DOI:	10.1088/0953-4075/46/22/224015
Journal or Publication Title:	J. Phys. B-At. Mol. Opt. Phys.
Volume:	46
Number:	22
Date:	2013
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1361-6455
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NUCLEAR-MAGNETIC-RESONANCE; POLARIZATION ECHOES; QUANTUM MEASUREMENT; STATES; DISSIPATION; EMERGENCE; ATTENUATION; TRANSITION; SIGNATURES; DYNAMICS Multiple languages Optics; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47176