Benestad, Jacob and Rasmussen, Torbjorn and Brovang, Bertram and Krause, Oswin and Fallahi, Saeed and Gardner, Geoffrey C. and Manfra, Michael J. and Marcus, Charles M. and Danon, Jeroen and Kümmeth, Ferdinand and Chatterjee, Anasua and van Nieuwenburg, Evert (2025) Automated In Situ Optimization and Disorder Mitigation in a Quantum Device. PHYSICAL REVIEW LETTERS, 135 (21): 216301. ISSN 0031-9007, 1079-7114
Full text not available from this repository. (Request a copy)Abstract
We investigate automated in situ optimization of the potential landscape in a quantum point contact device, using a 3 x 3 gate array patterned atop the constriction. Optimization is performed using the covariance matrix adaptation evolutionary strategy, for which we introduce a metric for how "steplike" the conductance is as the channel becomes constricted. We first perform the optimization of the gate voltages in a tight-binding simulation and show how such in situ tuning can be used to mitigate a random disorder potential. The optimization is then performed in a physical device in experiment, where we also observe a marked improvement in the quantization of the conductance resulting from the optimization procedure.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 31 Mar 2026 09:50 |
| Last Modified: | 31 Mar 2026 09:50 |
| URI: | https://pred.uni-regensburg.de/id/eprint/67840 |
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