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

Philip Krantz (), Andreas Bengtsson, Michaël Simoen, Simon Gustavsson, Vitaly Shumeiko, W. D. Oliver, C. M. Wilson, Per Delsing and Jonas Bylander ()
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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
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

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms11417

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