Flux qubit noise spectroscopy using Rabi oscillations under strong driving conditions
Name
PhysRevB.89.020503.pdf
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Author(s)
Yoshihara, Fumiki
Nakamura, Yasunobu
Yan, Fei
Gustavsson, Simon
Bylander, Jonas
Oliver, William D.
Tsai, Jaw-Shen
Date Issued
January 2014
Journal
Physical Review B
Publisher
American Physical Society
Citation
Yoshihara, Fumiki, Yasunobu Nakamura, Fei Yan, Simon Gustavsson, Jonas Bylander, William D. Oliver, and Jaw-Shen Tsai. “Flux Qubit Noise Spectroscopy Using Rabi Oscillations Under Strong Driving Conditions.” Phys. Rev. B 89, no. 2 (January 2014). © 2014 American Physical Society
Version
Final published version
Abstract
We infer the high-frequency flux noise spectrum in a superconducting flux qubit by studying the decay of Rabi oscillations under strong driving conditions. The large anharmonicity of the qubit and its strong inductive coupling to a microwave line enabled high-amplitude driving without causing significant additional decoherence. Rabi frequencies up to 1.7 GHz were achieved, approaching the qubit's level splitting of 4.8 GHz, a regime where the rotating-wave approximation breaks down as a model for the driven dynamics. The spectral density of flux noise observed in the wide frequency range decreases with increasing frequency up to 300 MHz, where the spectral density is not very far from the extrapolation of the 1/f spectrum obtained from the free-induction-decay measurements. We discuss a possible origin of the flux noise due to surface electron spins.
MIT Department
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.89.020503
