NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Kinetic Inductance Traveling Wave Amplifiers For Multiplexed Qubit Readout

Published

Author(s)

Leonardo Ranzani, K. C. Fong, G. Ribell, Tomas A. Ohki, David P. Pappas, Mustafa Bal, Xian Wu, Robert P. Erickson, Junling Long, Hsiang S. Ku

Abstract

We describe a kinetic inductance traveling-wave (KIT) amplifier suitable for superconducting quantum information measurements and characterize its wideband scattering and noise properties. We use mechanical microwave switches to calibrate the four amplifier scattering parameters up to the device input and output connectors at the dilution refrigerator base temperature and a tunable temperature load to characterize the amplifier noise. Finally, we demonstrate the high fidelity simultaneous dispersive readout of two superconducting transmon qubits. The KIT amplifier provides low-noise amplification of both readout tones with readout fidelities in excess of 89% and negligible effect on qubit lifetime and coherence.
Citation
Applied Physics Letters
Volume
113
Issue
24
Pub Type
Journals

Download Paper

DOI Link

Keywords

Quantum information, amplifier, cryogenic, low noise, wide Bandwidth, high dynamic range
Quantum information science

Citation

Ranzani, L. , Fong, K. , Ribell, G. , Ohki, T. , Pappas, D. , Bal, M. , Wu, X. , Erickson, R. , Long, J. and Ku, H. (2018), Kinetic Inductance Traveling Wave Amplifiers For Multiplexed Qubit Readout, Applied Physics Letters, [online], https://doi.org/10.1063/1.5063252 (Accessed October 14, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created December 9, 2018, Updated October 12, 2021
Was this page helpful?