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

• URL: http://arxiv.org/abs/2503.19891v1
• Date: Tue, 25 Mar 2025 17:53:33 GMT
• Title: Predicted third-order sweet spots for phi-junction Josephson parametric amplifiers
• Authors: Tasnum Reza, Sergey M. Frolov,
• Abstract summary: Hybrid superconductor-semiconductor nanowire Josephson junctions exhibit skewed and phi-shifted current phase relations.<n>A dominant third-order nonlinearity can be achieved by tuning the magnetic field to a sweet spot.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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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