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 11417

Scalable 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

More information

Latest update

4/5/2022 1