Concentric transmon qubit featuring fast tunability and an anisotropic magnetic dipole moment

Braumüller, J. et al. (2016) Concentric transmon qubit featuring fast tunability and an anisotropic magnetic dipole moment. Applied Physics Letters, 108(3), 032601. (doi:10.1063/1.4940230)

154846.pdf - Accepted Version



We present a planar qubit design based on a superconducting circuit that we call concentric transmon. While employing a straightforward fabrication process using Al evaporation and lift-off lithography, we observe qubit lifetimes and coherence times in the order of 10 μs10 μs. We systematically characterize loss channels such as incoherent dielectric loss, Purcell decay and radiative losses. The implementation of a gradiometric SQUID loop allows for a fast tuning of the qubit transition frequency and therefore for full tomographic control of the quantum circuit. Due to the large loop size, the presented qubit architecture features a strongly increased magnetic dipole moment as compared to conventional transmon designs. This renders the concentric transmon a promising candidate to establish a site-selective passive direct ẐẐ coupling between neighboring qubits, being a pending quest in the field of quantum simulation.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Weides, Professor Martin
Authors: Braumüller, J., Sandberg, M., Vissers, M. R., Schneider, A., Schlör, S., Grünhaupt, L., Rotzinger, H., Marthaler, M., Lukashenko, A., Dieter, A., Ustinov, A. V., Weides, M., and Pappas, D. P.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Physics Letters
Publisher:AIP Publishing
ISSN (Online):1077-3118
Published Online:21 January 2016
Copyright Holders:Copyright © 2016 AIP Publishing LLC
First Published:First published in Applied Physics Letters 108(3): 032601
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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