Kerr nonlinearity and three-wave mixing in superconducting resonators hosting Al-InAs weak links
Researchers report superconducting microwave resonators that incorporate aluminium-indium arsenide (Al-InAs) weak links and exhibit both cubic nonlinearity for three-wave mixing and quartic Kerr nonlinearity. The work examines these nonlinearities in the context of parametric amplification and continuous-variable quantum information tasks, noting that quartic contributions can limit device performance.
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What this could mean
- 0–2 yearsPlausible
Within two years, these Al-InAs weak-link resonators could be engineered to suppress the quartic Kerr term enough to serve as on-chip three-wave mixing elements for Josephson parametric amplifiers or continuous-variable entanglement sources.
The devices already produce three-wave mixing, a capability typically added with separate nonlinear components. If weak-link geometry or flux bias can be tuned to reduce the Kerr contribution while preserving cubic nonlinearity, existing superconducting circuit fabrication could integrate these resonators into near-term parametric amplification and continuous-variable cluster-state generation experiments.
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