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We present microwave measurements of a high quality factor superconductingresonator incorporating two aluminum nanobridge Josephson junctions in a loopshunted by an on-chip capacitor. Trapped quasiparticles (QPs) shift theresonant frequency, allowing us to probe the trapped QP number and energydistribution and to quantify their lifetimes. We find that the trapped QPpopulation obeys a Gibbs distribution above 75 mK, with non-Poissonian trappingstatistics. Our results are in quantitative agreement with the Andreev boundstate model of transport, and demonstrate a practical means to quantify on-chipQP populations and validate mitigation strategies in a cryogenic environment.

Single Quasiparticle Trapping in Aluminum Nanobridge Josephson Junctions