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The tunneling of quasiparticles (QPs) across Josephson junctions (JJs)detrimentally affects the coherence of superconducting and charge-parityqubits, and is shown to occur more frequently in magnetic fields. Here wedemonstrate the parity lifetime to survive in excess of 50$\,\mathrm{\mu}$s inmagnetic fields up to 1$\,$T, utilising a semiconducting nanowire transmon todetect QP tunneling in real time. We exploit gate-tunable QP filters and findmagnetic-field-enhanced parity lifetimes, consistent with increased QP trappingby the ungated nanowire due to orbital effects. Our findings highlight theimportance of QP trap engineering for building magnetic-field compatible hybridsuperconducting circuits.

Quasiparticle trapping by orbital effect in a hybrid superconducting-semiconducting circuit