A Josephson junction defect spectrometer for measuring two-level systems
A Josephson junction defect spectrometer for measuring two-level systems
We have fabricated and measured Josephson junction (JJ) defect spectrometers, which are frequency-tunable, nearly harmonic oscillators that probe strongly coupled two-level systems (TLSs) in the barrier of a JJ. The JJDSs accommodate a wide range of junction inductances, LJ, while maintaining a resonance frequency, fres, in the range of 4–8 …