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DTSTART:20240310T070000
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DTSTART:20231105T060000
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DTSTART;TZID=America/Toronto:20240516T103000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20240516T113000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/long-lived-
 transmons-different-electrode-layouts
LOCATION:QNC - Quantum Nano Centre 200 University Avenue West 1201 Waterloo
  ON N2L 3G1 Canada
SUMMARY:Long-lived transmons with different electrode layouts
CLASS:PUBLIC
DESCRIPTION:IQC SEMINAR - UNIVERSTY OF MARYLAND\n\nQuantum-Nano Centre\, 20
 0 University Ave West\, Room QNC 1201 Waterloo\,\nON CA N2L 3G1\n\n In th
 e realm of quantum computing\,non-equilibrium quasiparticle\ntunneling may
  be a significant loss mechanism in transmon\nqubits. Understanding the b
 ehavior of these quasiparticles across\njunctions may lead to improved qu
 bit devices . One approach involves\nthe fabrication of asymmetric transm
 ons through gap-engineering\ntechniques aimed at mitigating quasiparticle 
 tunneling and subsequent\nloss. In our research\, we have conducted repeat
 ed measurements of the\nrelaxation time (T1) in Al/AlOx/Al transmons featu
 ring electrodes with\nvarying superconducting gap values. Specifically\, o
 ne device utilized\na first-layer electrode formed via thermal evaporation
  of nominally\npure Al\, while the counter-electrode incorporated oxygen-d
 oped Al.\nThis device exhibited notable fluctuations in T1\, ranging from\
 napproximately 100 μs to slightly over 300 μs at 20 mK. Additionally\,\n
 we explored different configurations of junction layouts in an effort\nto 
 enhance device performance.
DTSTAMP:20260419T052827Z
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