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Magnetic-field-resilient superconducting circuits enable sensing applicationsand hybrid quantum-computing architectures involving spin or topological qubitsand electro-mechanical elements, as well as studying flux noise andquasiparticle loss. We investigate the effect of in-plane magnetic fields up to1 T on the spectrum and coherence times of thin-film 3D aluminum transmons.Using a copper cavity, unaffected by strong magnetic fields, we can solelyprobe the magnetic-field effect on the transmons. We present data on asingle-junction and a SQUID transmon, that were cooled down in the same cavity.As expected, transmon frequencies decrease with increasing fields, due to asuppression of the superconducting gap and a geometric Fraunhofer-likecontribution. Nevertheless, the thin-film transmons show strong magnetic-fieldresilience: both transmons display microsecond coherence up to at least 0.65 T,and $T_1$ remains above 1 $\mathrm{\mu}$s over the entire measurable range.SQUID spectroscopy is feasible up to 1 T, the limit of our magnet. We concludethat thin-film aluminum Josephson junctions are a suitable hardware forsuperconducting circuits in the high-magnetic-field regime.

Magnetic-field resilience of 3D transmons with thin-film Al/AlO$_x$/Al Josephson junctions approaching 1 T