Readout Induced Transitions in a Driven Superconducting Transmon Qubit

ORAL

Abstract

Dispersive readout via a coupled resonator has become a staple component of high fidelity superconducting qubit systems. Ideally, reading out a qubit should not disturb its state, but previous work (Sank et al, PRL 117) has found that dispersive readout can cause undesired transitions in transmon qubits. In this talk, I will show that additional transitions are possible when the qubit is also driven, and that these transitions can be detected using qubit spectroscopy at high resonator photon numbers. These transitions can be predicted by examining the joint qubit-resonator states in the Jaynes-Cummings ladder. I will also show that this phenomenon has important consequences for readout in multiqubit devices.

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Presenters

  • Zijun Chen

    Physics, Univ of California - Santa Barbara, UC Santa Barbara, Univ of California - Santa Barbara, UCSB, Google

Authors

  • Zijun Chen

    Physics, Univ of California - Santa Barbara, UC Santa Barbara, Univ of California - Santa Barbara, UCSB, Google

  • Mostafa Khezri

    Physics, University of California, Riverside

  • Ben Chiaro

    Physics, Univ of California - Santa Barbara, UC Santa Barbara, Univ of California - Santa Barbara, UCSB, University of California - Santa Barbara, Physics, University of California, Santa Barbara

  • Andrew Dunsworth

    Physics, Univ of California - Santa Barbara, UC Santa Barbara, Univ of California - Santa Barbara, UCSB, University of California - Santa Barbara, Physics, University of California, Santa Barbara

  • Brooks Foxen

    UC Santa Barbara, Univ of California - Santa Barbara, University of California - Santa Barbara, Physics, University of California, Santa Barbara

  • Charles Neill

    Physics, Univ of California - Santa Barbara, UC Santa Barbara, Univ of California - Santa Barbara, UCSB, Physics, University of California, Santa Barbara

  • James Wenner

    Physics, Univ of California - Santa Barbara, Univ of California - Santa Barbara, UCSB, University of California - Santa Barbara, Physics, University of California, Santa Barbara

  • Alexander Korotkov

    Univ of California - Riverside, Department of Electrical and Computer Engineering, University of California, University of California, Riverside, Physics, University of California, Riverside, Electrical Engineering, Univ of California - Riverside

  • John Martinis

    Google, Google Inc - Santa Barbara, Google Inc., UC Santa Barbara and Google