Probing flux and charge noise with macroscopic resonant tunneling
- URL: http://arxiv.org/abs/2210.01714v1
- Date: Tue, 4 Oct 2022 16:15:34 GMT
- Title: Probing flux and charge noise with macroscopic resonant tunneling
- Authors: Alexander M. Whiticar, Anatoly Y. Smirnov, Trevor Lanting, Jed
Whittaker, Fabio Altomare, Teresa Medina, Rahul Deshpande, Sara Ejtemaee,
Emile Hoskinson, Michael Babcock, Mohammad H. Amin
- Abstract summary: We measure rates of incoherent tunneling from the lowest energy state in the initial well to the ground.
We develop a theoretical model that allows us to extract information about flux and charge noise within one experimental setup.
- Score: 45.36850110238202
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We report on measurements of flux and charge noise in an rf-SQUID flux qubit
using macroscopic resonant tunneling (MRT). We measure rates of incoherent
tunneling from the lowest energy state in the initial well to the ground and
first excited states in the target well. The result of the measurement consists
of two peaks. The first peak corresponds to tunneling to the ground state of
the target well, and is dominated by flux noise. The second peak is due to
tunneling to the excited state and is wider due to an intrawell relaxation
process dominated by charge noise. We develop a theoretical model that allows
us to extract information about flux and charge noise within one experimental
setup. The model agrees very well with experimental data over a wide dynamic
range and provides parameters that characterize charge and flux noise.
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