Experiments on a three mode circuit QED system

ORAL

Abstract

Current research in superconducting circuit QED is working towards combining an increasing number of cavities and qubits to investigate larger scale quantum systems. Here we will discuss measurements on a system consisting of two three-dimensional microwave resonators coupled to a single transmon qubit. We demonstrate that each mode of the system has sufficient anharmonicity to coherently manipulate the state of the lowest two energy levels. This allows us to measure the coherence of a single excitation in a mode and detect the frequency shift due to excitations of the other modes. These effects are important to consider when using a resonator as a quantum memory to decouple the quantum state from the rest of the system. Furthermore we show that we can use the state dependent shifts to detect the quantum state of one mode with another. The full characterization of the system allows us to determine the Hamiltonian and compare it to the theoretical predictions obtained with a nonlinear circuit QED model.

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Authors

  • Gerhard Kirchmair

    Applied Physics Department Yale University, Yale University

  • Brian Vlastakis

    Applied Physics Department Yale University, Yale University

  • Hanhee Paik

    Yale University, Department of Physics and Applied Physics, Yale University, Applied Physics Department Yale University

  • Simon Nigg

    Physics Department Yale University, Physics Department, Yale University

  • Luigi Frunzio

    Applied Physics Department, Yale University, Yale University, Department of Physics and Applied Physics, Yale University, Applied Physics Department Yale University, Applied Physics - Yale University, Yale University, Dept. of Applied Physics, Department of Applied Physics, Yale University

  • Steven Girvin

    Department of Physics, Yale University, Yale University, Physics Department Yale University, Physics Department, Yale University, Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA

  • Michel Devoret

    Yale University, Applied Physics, Yale University, Applied Physics Department Yale University, Department of Applied Physics, Yale University, Departments of Physics and Applied Physics, Yale University, Applied Physics - Yale University, Yale University, Dept. of Applied Physics, Applied Physics Dept. Yale University

  • Robert Schoelkopf

    Yale University, Department of Physics and Applied Physics, Yale University, Applied Physics Department Yale University