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.

parametric oscillator

quantum information


circuit QED



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Nature Communications

2041-1723 (ISSN)

Vol. 7 11417 11417

Scalable Superconducting Processors for Entangled Quantum Information Technology (ScaleQIT)

European Commission (EC), 2013-02-01 -- 2016-01-31.

Areas of Advance

Nanoscience and Nanotechnology (SO 2010-2017, EI 2018-)

Subject Categories

Other Physics Topics

Nano Technology

Condensed Matter Physics



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