Single-shot read-out of a superconducting qubit using a Josephson parametric oscillator
Artikel i vetenskaplig tidskrift, 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.

parametric oscillator

quantum information

single-shot

circuit QED

read-out

Författare

Philip Krantz

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Andreas Bengtsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Michael Roger Andre Simoen

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Simon Gustavsson

Massachusetts Institute of Technology (MIT)

Vitaly Shumeiko

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

William Oliver

Massachusetts Institute of Technology (MIT)

MIT Lincoln Laboratory

Christopher Wilson

University of Waterloo

Per Delsing

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Jonas Bylander

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Nature Communications

2041-1723 (ISSN)

Vol. 7 11417 11417

Scalable Superconducting Processors for Entangled Quantum Information Technology (ScaleQIT)

Europeiska kommissionen (FP7), 2013-02-01 -- 2016-01-31.

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Annan fysik

Nanoteknik

Den kondenserade materiens fysik

DOI

10.1038/ncomms11417

Mer information

Senast uppdaterat

2018-04-11