BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3618
DTSTART:20150129T220000Z
DTEND:20150129T230000Z
DTSTAMP:20260419T142728Z
LAST-MODIFIED:20150126T220557Z
LOCATION:4274 Chamberlin
SUMMARY:Noise in superconducting circuits: microscopic theory and open
  questions\, R. G. Herb Condensed Matter Seminar\, Lara Faoro\, Labora
 toire de Physique Theorique et Hautes Energies
DESCRIPTION:I review the main sources of noise in superconducting circ
 uits: charge noise\, critical current noise\, quasiparticle poisoning 
 and flux noise. I discuss the microscopic mechanism for these noises a
 nd show that charge and critical current noise are accounted for by th
 e microscopic model that assumes the presence of localized electron st
 ates at the Superconductor Insulator interfaces. Due to the large elec
 tron electron interaction these states form resonances close to the Fe
 rmi surface. These states serve as traps where the quasiparticles live
  for a long time. The spins of the quasiparticles in these states prod
 uce flux noise of the right magnitude and frequency dependence. Howeve
 r the correlation between the magnetization and susceptibility noise o
 bserved by R. McDermott remains unexplained.
URL:https://www.physics.wisc.edu/events/?id=3618
END:VEVENT
END:VCALENDAR