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Single-shot read-out of a superconducting qubit using a Josephson parametric oscillator

Author

Listed:
  • Philip Krantz

    (Microtechnology and Nanoscience, Chalmers University of Technology)

  • Andreas Bengtsson

    (Microtechnology and Nanoscience, Chalmers University of Technology)

  • Michaël Simoen

    (Microtechnology and Nanoscience, Chalmers University of Technology)

  • Simon Gustavsson

    (Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Vitaly Shumeiko

    (Microtechnology and Nanoscience, Chalmers University of Technology)

  • W. D. Oliver

    (Research Laboratory of Electronics, Massachusetts Institute of Technology
    MIT Lincoln Laboratory)

  • C. M. Wilson

    (Institute of Quantum Computing, University of Waterloo)

  • Per Delsing

    (Microtechnology and Nanoscience, Chalmers University of Technology)

  • Jonas Bylander

    (Microtechnology and Nanoscience, Chalmers University of Technology)

Abstract

We propose and demonstrate a read-out technique for a superconducting qubit by dispersively coupling it with a Josephson parametric oscillator. We employ a tunable quarter wavelength superconducting resonator and modulate its resonant frequency at twice its value with an amplitude surpassing the threshold for parametric instability. We map the qubit states onto two distinct states of classical parametric oscillation: one oscillating state, with 185±15 photons in the resonator, and one with zero oscillation amplitude. This high contrast obviates a following quantum-limited amplifier. We demonstrate proof-of-principle, single-shot read-out performance, and present an error budget indicating that this method can surpass the fidelity threshold required for quantum computing.

Suggested Citation

  • Philip Krantz & Andreas Bengtsson & Michaël Simoen & Simon Gustavsson & Vitaly Shumeiko & W. D. Oliver & C. M. Wilson & Per Delsing & Jonas Bylander, 2016. "Single-shot read-out of a superconducting qubit using a Josephson parametric oscillator," Nature Communications, Nature, vol. 7(1), pages 1-8, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11417
    DOI: 10.1038/ncomms11417
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    Cited by:

    1. Ait Chlih, Anas & Rahman, Atta ur, 2024. "Nonclassicality and teleportation fidelity probes in amplitude-tailored superconducting charge qubits," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 650(C).

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