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SUMMARY:New Frontiers in Superconducting Quantum Hardware - Martin Weides 
 (Glasgow)
DTSTART:20250521T151500Z
DTEND:20250521T161500Z
UID:TALK228748@talks.cam.ac.uk
CONTACT:Lucas Sá
DESCRIPTION:Superconducting quantum circuits have made impressive advances
 \, yet face core limitations that hinder coherence\, reproducibility\, and
  scalability. Chief among these are decoherence from two-level systems (TL
 S)\, the variability of amorphous tunnel barriers\, and constraints from l
 ow-gap superconductors like aluminum.\nIn this talk\, I will present our g
 roup’s efforts to overcome these challenges by developing a fully niobiu
 m-based fabrication process featuring in-situ trilayer Nb/AlO_x/Nb junctio
 ns. This approach yields cleaner interfaces\, improved junction uniformity
 \, and enables operation at higher frequencies and temperatures thanks to 
 niobium’s larger superconducting gap. These advances directly address th
 e limitations imposed by the low cooling power available at millikelvin te
 mperatures—typically just a few hundred microwatts at 100 mK—by allo
 wing qubit operation closer to 1 K and reducing thermal sensitivity and 
 constraints.\nWe are also pursuing nanobridge junctions as a promising alt
 ernative to tunnel junctions\, eliminating dielectric barriers and potenti
 ally reducing TLS-related loss. Beyond device-level improvements\, our fab
 rication process is designed with scalability and foundry compatibility in
  mind\, supporting reproducible and manufacturable superconducting quantum
  technologies. Finally\, I will highlight our work on integrating control 
 and readout electronics into the cryogenic environment\, a key step toward
  compact\, scalable quantum processors.\nTogether\, these developments sup
 port the global effort to push superconducting qubit platforms beyond curr
 ent architectural and material limitations\, paving the way toward more ro
 bust\, scalable\, and commercially viable quantum computing systems. Targe
 t applications include quantum simulation\, combinatorial optimization\, m
 aterials discovery\, and fault-tolerant computing.
LOCATION:Lecture Teatre\, Ray Dolby Centre
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