Non-linear dispersive interaction in superconducting circuit QED

ORAL

Abstract

In circuit quantum electrodynamics, the strong coupling between superconducting qubits and a coplanar waveguide resonator (CPW) has been utilized to study the light-atom interaction. When the qubit is detuned far away from the resonator in frequency, linear dispersive interaction has been used for the readout of qubit states by measuring the pulling frequency of the resonator. Alternatively, we investigate dispersive interaction in a broader regime by measuring the accumulated dynamic phase with Wigner tomography. In the quasi-adiabatic process of tuning the qubit frequency, the dynamic phase measurement can be pushed to the case of zero detuning with up to the five-photon Fock state in the CPW resonator. The exotic non-linear behaviors of the qubit on resonator cat state and coherent state have been revealed, strongly depending on the strength of dispersive interaction. Our experimental data are consistent with the numerical calculation using the Jaynes-Cumming model.

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Authors

  • Yi Yin

    Physics Department, University of California, Santa Barbara

  • Haohua Wang

    University of California, Santa Barbara, Physics Department, University of California, Santa Barbara

  • Matteo Mariantoni

    Walther-Meissner-Institut and TU Muenchen, Garching, Germany, Physics Department, University of California, Santa Barbara

  • Radoslaw Bialczak

    Physics Department, University of California, Santa Barbara, UCSB

  • Mike Lenander

    Physics Department, University of California, Santa Barbara

  • Eric Lucero

    Physics Department, University of California, Santa Barbara

  • Matthew Neeley

    Physics Department, University of California, Santa Barbara

  • Aaron O'Connell

    Physics Department, University of California, Santa Barbara

  • Daniel Sank

    UCSB, Physics Department, University of California, Santa Barbara

  • Jim Wenner

    UC Santa Barbara, Physics Department, University of California, Santa Barbara

  • Tsuyoshi Yamamoto

    NanoElectronics Research Laboratories, NEC Corporation, Japan

  • Andrew Cleland

    Department of Physics, UC Santa Barbara, Physics Department, University of California, Santa Barbara

  • John Martinis

    University of California, Santa Barbara, UC Santa Barbara, University of California at Santa Barbara, Physics Department, University of California, Santa Barbara, UCSB