Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

High-Fidelity Qubit Measurement using a Superconducting Low-Inductance Undulatory Galvanometer Microwave Amplifier

Ted Thorbeck, David J. Hover, Shaojiang Zhu, Guilhem J. Ribeill, D. Sank, R. Barends, John M. Martinis, R. McDermott

Published Mar 5, 2014• 0 citations
OpenAlex

Related papers

Ultralow Noise Microwave Amplifier Based on the Superconducting Low-inductance Undulatory Galvanometer

Shaojiang Zhu, David J. Hover, Guilhem J. Ribeill +1 more

Bulletin of the American Physical Society•Mar 20, 2013•0 citations

Development of integrated, on-chip microwave amplifiers for superconducting qubit measurement

D.M. Toyli, Andrew Eddins, Eli M. Levenson-Falk +4 more

Bulletin of the American Physical Society•Mar 5, 2014•0 citations

High fidelity qubit readout with the superconducting low-inductance undulatory galvanometer microwave amplifier

David J. Hover, S. Zhu, Ted Thorbeck +6 more

We describe the high fidelity dispersive measurement of a superconducting qubit using a microwave amplifier based on the Superconducting Low-inductance Undulatory Galvanometer (SLUG). The SLUG preamplifier achieves gain of 19 dB and yields a signal-to-noise ratio improvement of 9 dB over a state-of-the-art HEMT amplifier. We demonstrate a separation fidelity of 99% at 700 ns compared to 59% with the HEMT alone. The SLUG displays a large dynamic range, with an input saturation power corresponding to 700 photons in the readout cavity.

arXiv:1312.7579•Applied Physics Letters•Apr 14, 2014•24 citations

High fidelity readout of a transmon qubit using a superconducting low-inductance undulatory galvanometer microwave amplifier

Yanbing Liu, Srikanth J. Srinivasan, David J. Hover +3 more

We report high-fidelity, quantum non-demolition, single-shot readout of a superconducting transmon qubit using a dc-biased superconducting low-inductance undulatory galvanometer (SLUG) amplifier. The SLUG improves the system signal-to-noise ratio by in a window compared with a bare high electron mobility transistor amplifier. An optimal cavity drive pulse is chosen using a genetic search algorithm, leading to a maximum combined readout and preparation fidelity of with a measurement time of . Using post-selection to remove preparation errors caused by heating, we realize a combined preparation and readout fidelity of .

arXiv:1401.5184•New Journal of Physics•Nov 4, 2014•12 citations

High Fidelity Measurement of Single and Multi-qubit Superconducting Quantum Circuits

S. Kundu, Sumeru Hazra, Tanay Roy +4 more

Bulletin of the American Physical Society•Mar 5, 2018•0 citations

Superconducting low-inductance undulatory galvanometer microwave amplifier: Theory

Guilhem J. Ribeill, David J. Hover, Yung‐Fu Chen +2 more

We describe a novel scheme for low-noise phase-insensitive linear amplification at microwave frequencies based on the superconducting low-inductance undulatory galvanometer (SLUG). Direct integration of the junction equations of motion provides access to the full scattering matrix of the SLUG. We discuss the optimization of SLUG amplifiers and calculate amplifier gain and noise temperature in both the thermal and quantum regimes. Loading of the SLUG element by the finite input admittance is taken into account, and strategies for decoupling the SLUG from the higher-order modes of the input circuit are discussed. The microwave SLUG amplifier is expected to achieve noise performance approaching the standard quantum limit in the frequency range from 5–10 GHz, with gain around 15 dB for a single-stage device and instantaneous bandwidths of order 1 GHz.

Journal of Applied Physics•Nov 15, 2011•27 citations
We describe the high fidelity dispersive measurement of a superconducting qubit using a microwave amplifier based on the Superconducting Low-inductance Undulatory Galvanometer (SLUG). The SLUG preamplifier achieves gain of 19 dB and yields a signal-to-noise ratio improvement of 9 dB over a state-of-the-art HEMT amplifier. We demonstrate a separation fidelity of 99% at 700 ns compared to 59% with the HEMT alone. The SLUG displays a large dynamic range, with an input saturation power corresponding to 700 photons in the readout cavity.
We report high-fidelity, quantum non-demolition, single-shot readout of a superconducting transmon qubit using a dc-biased superconducting low-inductance undulatory galvanometer (SLUG) amplifier. The SLUG improves the system signal-to-noise ratio by in a window compared with a bare high electron mobility transistor amplifier. An optimal cavity drive pulse is chosen using a genetic search algorithm, leading to a maximum combined readout and preparation fidelity of with a measurement time of . Using post-selection to remove preparation errors caused by heating, we realize a combined preparation and readout fidelity of .
We describe a novel scheme for low-noise phase-insensitive linear amplification at microwave frequencies based on the superconducting low-inductance undulatory galvanometer (SLUG). Direct integration of the junction equations of motion provides access to the full scattering matrix of the SLUG. We discuss the optimization of SLUG amplifiers and calculate amplifier gain and noise temperature in both the thermal and quantum regimes. Loading of the SLUG element by the finite input admittance is taken into account, and strategies for decoupling the SLUG from the higher-order modes of the input circuit are discussed. The microwave SLUG amplifier is expected to achieve noise performance approaching the standard quantum limit in the frequency range from 5–10 GHz, with gain around 15 dB for a single-stage device and instantaneous bandwidths of order 1 GHz.