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arXiv · 2503.19891

Predicted third-order sweet spots for phi-junction Josephson parametric amplifiers

Tasnum Reza·Sergey M. Frolov
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Abstract

Hybrid superconductor-semiconductor nanowire Josephson junctions exhibit skewed and phi-shifted current phase relations when an in-plane magnetic field is applied along the weak link's spin-orbit effective field direction. These junctions can have an asymmetric Josephson potential with odd-order nonlinearities. A dominant third-order nonlinearity can be achieved by tuning the magnetic field to a sweet spot. Sweet spots persist when higher order Josephson harmonics are included. This makes it possible to have a single Josephson junction dipole element with three-wave mixing capability, which is favorable for pump-efficient amplification. Electrostatic gate tunability of the semiconductor weak link can make it operable within an extended range of working frequencies, and the inclusion of micromagnets can facilitate near-zero magnetic field operation.

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Tasnum Reza, Sergey M. Frolov. 2025-03-25. Predicted third-order sweet spots for phi-junction Josephson parametric amplifiers. https://doi.org/10.21468/scipostphys.20.3.089

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