Single-shot read-out of a superconducting qubit using a Josephson parametric oscillator
Journal article, 2016
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, singleshot read-out performance, and present an error budget indicating that this method can surpass the fidelity threshold required for quantum computing.
circuit QED
quantum information
read-out
parametric oscillator
single-shot
Author
Philip Krantz
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Andreas Bengtsson
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Michael Roger Andre Simoen
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Simon Gustavsson
Massachusetts Institute of Technology (MIT)
Vitaly Shumeiko
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
William Oliver
Massachusetts Institute of Technology (MIT)
MIT Lincoln Laboratory
Christopher Wilson
University of Waterloo
Per Delsing
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Jonas Bylander
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Nature Communications
2041-1723 (ISSN) 20411723 (eISSN)
Vol. 7 11417 11417Scalable Superconducting Processors for Entangled Quantum Information Technology (ScaleQIT)
European Commission (EC) (EC/FP7/600927), 2013-02-01 -- 2016-01-31.
Areas of Advance
Nanoscience and Nanotechnology
Subject Categories
Other Physics Topics
Nano Technology
Condensed Matter Physics
DOI
10.1038/ncomms11417