Demonstrated gate-tunable supercurrents in Josephson junctions on Ge quantum wells with Ic >100 nA and IcRn=8.63 μV using in-situ Al contacts and deep mesa etch for low-loss integration.
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Alkyl-phosphonate SAMs on Nb thin films suppress oxide regrowth and maintain temporal stability in superconducting resonators over six days at 10 mK, with SAM TLS loss quantified at approximately 5 times 10 to the minus 7 using a two-component model.
Optimizing electron-beam lithography via smaller beam step size and avoiding main-field stitching reduces random and systematic frequency scatter four-fold in superconducting microstrip resonators.
Cryogenic GaAs SAW resonators achieve Q factors up to 28,000 in the GHz range via systematic geometry and orientation tuning, with mesa steps added to study scattering and dissipation for quantum acoustics applications.
Nanogap patterning on NbTi thin-film resonators decreases TC by 1.5 K and raises dfres/dT to 62 MHz/K at 4.2 K, enhancing cryogenic thermometry sensitivity by 10x.
citing papers explorer
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High temporal stability of niobium superconducting resonators by surface passivation with organophosphonate self-assembled monolayers
Alkyl-phosphonate SAMs on Nb thin films suppress oxide regrowth and maintain temporal stability in superconducting resonators over six days at 10 mK, with SAM TLS loss quantified at approximately 5 times 10 to the minus 7 using a two-component model.