Quantum chaos in the mesoscopic device for the Josephson flux qubit

Abstract

We show that the three-junction SQUID device designed for the Josephson flux qubit can be used to study quantum chaos when operated at high energies. In the parameter region where the system is classically chaotic we analyze the spectral statistics. The nearest neighbor distributions $P(s)$ are well fitted by the Berry Robnik theory employing as free parameters the pure classical measures of the chaotic and regular regions of phase space in the different energy regions. The phase space representation of the wave functions is obtained via the Husimi distributions and the localization of the states on classical structures is analyzed.

Final version, to be published in Phys. Rev. B. References added, introduction and conclusions improved

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Cited by in corpus (5)

• Statistics of Chaotic Resonances in an Optical Microcavity
• Intrinsic leakage of the Josephson flux qubit and breakdown of the two-level approximation for strong driving
• Chaos can act as a decoherence suppressor
• Large Amplitude Harmonic Driving of Highly Coherent Flux Qubits
• Counting statistics of chaotic resonances at optical frequencies: theory and experiments