Tuesday, April 16, 2013

1304.3582 (Jonas Larson et al.)

Chaos in circuit QED: decoherence, localization, and nonclassicality    [PDF]

Jonas Larson, Duncan H. J. O'Dell
We study the open system dynamics of a circuit QED model operating in the ultrastrong coupling regime. If the resonator is pumped periodically in time the underlying classical system is chaotic, implying build-up of seemingly irregular sub-Planck structures of the Wigner phase space distribution. 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 bi-partite 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 the inherent quantum nature of the qubit subsystem and in particular the sustainable quantum correlations shared between the qubit and the field.
View original: http://arxiv.org/abs/1304.3582

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