This paper investigates the accuracy of the standard current-phase relation (CPR) in describing the energy spectra of transmon artificial atoms. The authors find that the standard sinusoidal CPR is insufficient and demonstrate that a mesoscopic model incorporating higher Josephson harmonics provides significantly better agreement with experimental data. The presence and impact of these harmonics have important implications for the development of AlOx-based quantum technologies.
Publisher
Nature Physics
Published On
Feb 14, 2024
Authors
Dennis Willsch, Dennis Rieger, Patrick Winkel, Madita Willsch, Christian Dickel, Jonas Krause, Yoichi Ando, Raphaël Lescanne, Zaki Leghtas, Nicholas T. Bronn, Pratiti Deb, Olivia Lanes, Zlatko K. Minev, Benedikt Dennig, Simon Geisert, Simon Günzler, Sören Ihssen, Patrick Paluch, Thomas Reisinger, Roudy Hanna, Jin Hee Bae, Peter Schüffelgen, Detlev Grützmacher, Luiza Buimaga-larinca, Cristian Morari, Wolfgang Wernsdorfer, David P. DiVincenzo, Kristel Michielsen, Gianluigi Catelani, loan M. Pop
Tags
current-phase relation
transmon artificial atoms
Josephson harmonics
quantum technologies
energy spectra
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