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Voltage-controlled synthesis of higher harmonics in hybrid Josephson junction circuits

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arxiv 2402.11603 v2 pith:V3UN6TLX submitted 2024-02-18 cond-mat.mes-hall cond-mat.supr-con

Voltage-controlled synthesis of higher harmonics in hybrid Josephson junction circuits

L. Banszerus , W. Marshall , C. W. Andersson , T. Lindemann , M. J. Manfra , C. M. Marcus , S. Vaitiek\.enas This is my paper
classification cond-mat.mes-hall cond-mat.supr-con
keywords josephsonhybridjunctionstuningcontentcouplingharmonicseries
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We report measurements of the current-phase relation of two voltage-controlled semiconductor-superconductor hybrid Josephson junctions (JJs) in series. The two hybrid junctions behave similar to a single-mode JJ with effective transparency determined by the ratio of Josephson coupling strengths of the two junctions. Gate-voltage control of Josephson coupling (measured from switching currents) allows tuning of the harmonic content from sinusoidal, for asymmetric tuning, to highly nonsinusoidal, for symmetric tuning. The experimentally observed tunable harmonic content agrees with a model based on two conventional (sinusoidal) JJs in series.

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    quant-ph 2025-12 conditional novelty 6.0

    An SIS junction in series with a SQUID gives a superconducting qubit with a flux-tunable second Josephson harmonic of about 10% of the fundamental.