Low insertion loss planar Josephson traveling wave parametric amplifier

Josephson traveling wave parametric amplifiers (TWPAs) with large gain bandwidth and quantum-limited added noise are a cornerstone of a wide range of quantum technologies that rely on highly efficient weak microwave signal detection. However, the presence of dielectric loss has been a significant limiting factor in achieving optimal quantum efficiency for TWPAs. In this talk, we present the design, fabrication, and preliminary experimental characterization of a four-wave mixing TWPA based on linear coplanar waveguide with periodically loaded Josephson junctions. By using coplanar waveguides with several micrometers-wide gaps, our TWPA show almost no insertion loss. The fabrication process we used is compatible with standard qubit fabrication processes, which allows for the integration of qubits and traveling wave parametric amplifiers on the same chip.