Universität zu Köln

Krause, J., Dickel, C., Vaal, E., Vielmetter, M., Feng, J., Bounds, R., Catelani, G., Fink, J. M. and Ando, Yoichi ORCID: 0000-0002-3553-3355 (2022). Magnetic Field Resilience of Three-Dimensional Transmons with Thin-Film Al/AlOx/Al Josephson Junctions Approaching 1 T. Phys. Rev. Appl., 17 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2331-7019

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Abstract

Magnetic-field-resilient superconducting circuits enable sensing applications and hybrid quantum computing architectures involving spin or topological qubits and electromechanical elements, as well as studying flux noise and quasiparticle loss. We investigate the effect of in-plane magnetic fields up to 1 T on the spectrum and coherence times of thin-film three-dimensional aluminum transmons. Using a copper cavity, unaffected by strong magnetic fields, we can probe solely the effect of magnetic fields on the transmons. We present data on a single-junction and a superconducting-quantum-interference-device (SQUID) transmon that are cooled down in the same cavity. As expected, the transmon frequencies decrease with increasing field, due to suppression of the superconducting gap and a geometric Fraunhofer-like contribution. Nevertheless, the thin-film transmons show strong magnetic field resilience: both transmons display microsecond coherence up to at least 0.65 T, and T-1 remains above 1 mu s over the entire measurable range. SQUID spectroscopy is feasible up to 1 T, the limit of our magnet. We conclude that thin-film aluminum Josephson junctions are suitable hardware for superconducting circuits in the high-magnetic-field regime.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Krause, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dickel, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vaal, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vielmetter, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Feng, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bounds, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Catelani, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fink, J. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-675677
DOI:	10.1103/PhysRevApplied.17.034032
Journal or Publication Title:	Phys. Rev. Appl.
Volume:	17
Number:	3
Date:	2022
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2331-7019
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67567