Related papers: Probing flux and charge noise with macroscopic resonant tunneling

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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