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State preparation and tomography in 3D multimode circuit QED

ORAL

Abstract

Multimode cavity quantum electrodynamics, where a two level system interacts simultaneously with many cavity modes, provides a versatile framework for quantum information processing and quantum optics. One platform for realizing this involves coupling a transmon circuit to a multimode superconducting microwave cavity, offering a combination of high coherences and strong interactions. Our implementation of such a multimode processor uses the quantum flute: a seamless rectangular 3D multimode cavity with a tailored mode dispersion, ~2 ms decay times, and single-photon cooperativities ~1 billion for 9 distinct modes. We present ways to take advantage of the nonlinearity of a single transmon circuit for universal control of all the cavity modes. These include quantum optimal control pulses that utilize photon number dependent phase shifts, and Hilbert space engineering with photon blockade. We use these schemes to prepare Fock states of increasing photon number in any mode and multimode entangled states. We also present a novel, general scheme for multimode Wigner tomography that does not require engineering of the dispersive shift, or the use of higher transmon levels.

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Presenters

  • Kevin He

    University of Chicago

Authors

  • Kevin He

    University of Chicago

  • Srivatsan Chakram

    Department of Physics and Astronomy, Rutgers University, Physics and Astronomy, Rutgers University, Rutgers University, University of Chicago

  • Akash Dixit

    University of Chicago

  • Andrew Oriani

    University of Chicago

  • Ravi K. Naik

    University of California, Berkeley, Univ of California – Berkeley, Physics, University of California, Berkeley, University of California Berkeley, Univ of California - Berkeley, Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley, University of California - Berkeley

  • Nelson Leung

    University of Chicago

  • Hyeokshin Kwon

    Samsung Adv Inst of Tech, Samsung Advanced Institute of Technology

  • Riju Banerjee

    University of Chicago, Physics, Pennsylvania State University, Pennsylvania State University

  • Wen-Long Ma

    University of Chicago

  • Liang Jiang

    University of Chicago, Department of Molecular Engineering, The University of Chicago, Pritzker School of Molecular Engineering, University of Chicago, Yale University, Pritzker school of molecular engineering, The University of Chicago

  • David I Schuster

    University of Chicago, The James Franck Institute and Department of Physics, University of Chicago, The James Franck Institute and Department of Physics, The University of Chicago