title: Simultaneous Bistability of a Qubit and Resonator in Circuit Quantum Electrodynamics.
abstract: We explore the joint activated dynamics exhibited by two quantum degrees of freedom: a cavity mode oscillator which is strongly coupled to a superconducting qubit in the strongly coherently driven dispersive regime. Dynamical simulations and complementary measurements show a range of parameters where both the cavity and the qubit exhibit sudden simultaneous switching between two metastable states. This manifests in ensemble averaged amplitudes of both the cavity and qubit exhibiting a partial coherent cancellation. Transmission measurements of driven microwave cavities coupled to transmon qubits show detailed features which agree with the theory in the regime of simultaneous switching.
authors.affiliation: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
authors.forename: Th K
authors.initials: TK
authors.lastname: Mavrogordatos
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: G
authors.initials: G
authors.lastname: Tancredi
authors.affiliation: Advanced Technology Institute and Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Elliott
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: M J
authors.initials: MJ
authors.lastname: Peterer
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Patterson
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: J
authors.initials: J
authors.lastname: Rahamim
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: P J
authors.initials: PJ
authors.lastname: Leek
authors.affiliation: Advanced Technology Institute and Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
authors.forename: E
authors.initials: E
authors.lastname: Ginossar
authors.affiliation: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
authors.forename: M H
authors.initials: MH
authors.lastname: Szymańska