Voltage-controlled synthesis of higher harmonics in hybrid Josephson junction circuits
arxiv(2024)
摘要
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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