Nearly symmetric SQUIDs biased at half flux reveal that the second harmonic in Al/AlOx Josephson junctions scales with junction energy as expected for series inductance, bounding intrinsic Andreev harmonics below 0.1% of the fundamental.
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Emergent Harmonics in Josephson Tunnel Junctions Due to Series Inductance
Nearly symmetric SQUIDs biased at half flux reveal that the second harmonic in Al/AlOx Josephson junctions scales with junction energy as expected for series inductance, bounding intrinsic Andreev harmonics below 0.1% of the fundamental.