Magnetic Field Resilience of Three-Dimensional Transmons with Thin-Film <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:msub><mml:mtext>Al/AlO</mml:mtext><mml:mi>x</mml:mi></mml:msub><mml:mo>/</mml:mo><mml:mtext>Al</mml:mtext></mml:math> Josephson Junctions Approaching 1 T

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