Escape of a Driven Quantum Josephson Circuit into Unconfined States

Raphaël Lescanne, Lucas Verney, Quentin Ficheux, Michel H. Devoret, Benjamin Huard, Mazyar Mirrahimi, and Zaki Leghtas
Phys. Rev. Applied 11, 014030 – Published 16 January 2019

Abstract

Josephson circuits have been ideal systems with which to study complex nonlinear dynamics that can lead to chaotic behavior and instabilities. More recently, Josephson circuits in the quantum regime, particularly in the presence of microwave drives, have demonstrated their ability to emulate a variety of Hamiltonians that are useful for the processing of quantum information. In this paper, we show that these drives lead to an instability that results in the escape of the circuit mode into states that are not confined by the Josephson cosine potential. We observe this escape in a ubiquitous circuit: a transmon embedded in a 3D cavity. When the transmon occupies these free-particle-like states, the circuit behaves as though the junction had been removed and all nonlinearities are lost. This work deepens our understanding of strongly driven Josephson circuits, which is important for fundamental and application perspectives, such as the engineering of Hamiltonians by parametric pumping.

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  • Received 22 May 2018
  • Revised 10 December 2018

DOI:https://doi.org/10.1103/PhysRevApplied.11.014030

© 2019 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsQuantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Raphaël Lescanne1,2, Lucas Verney2,1, Quentin Ficheux1,3, Michel H. Devoret4, Benjamin Huard3, Mazyar Mirrahimi2,5, and Zaki Leghtas6,1,2,*

  • 1Laboratoire Pierre Aigrain, Ecole Normale Supérieure, PSL Research University, CNRS, Université Pierre et Marie Curie, Sorbonne Universités, Université Paris Diderot, Sorbonne Paris-Cité, 24 rue Lhomond, 75231 Paris Cedex 05, France
  • 2QUANTIC team, INRIA de Paris, 2 Rue Simone Iff, 75012 Paris, France
  • 3Laboratoire de Physique, Ecole Normale Supérieure de Lyon, 46 allée d’Italie, 69364 Lyon Cedex 7, France
  • 4Department of Applied Physics, Yale University, 15 Prospect Street, New Haven, Connecticut 06520, USA
  • 5Yale Quantum Institute, Yale University, 17 Hillhouse Avenue, New Haven, Connecticut 06520, USA
  • 6Centre Automatique et Systèmes, Mines-ParisTech, PSL Research University, 60, bd Saint-Michel, 75006 Paris, France

  • *leghtas@gmail.com

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Vol. 11, Iss. 1 — January 2019

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