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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-8687
DTSTART:20240320T170000Z
DTEND:20240320T180000Z
DTSTAMP:20260413T223555Z
LAST-MODIFIED:20240318T015002Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Protecting Qubits from High-energy Impacts\, R. G. Herb Conden
 sed Matter Seminar\, Britton Plourde\, Syracuse University
DESCRIPTION:Superconducting circuits are an attractive system for form
 ing qubits in a quantum computer because of the natural energy gap to 
 excitations in the superconductor. However\, experimentally it is obse
 rved that superconducting qubits have dissipative excitations above th
 e superconducting ground state\, known as quasiparticles\, that can be
  generated in bursts\, leading to correlated errors between qubits acr
 oss an array. Such correlated errors pose a significant challenge for 
 current quantum error correction schemes. Quasiparticle bursts can be 
 produced by a range of energy-deposition sources\, including the impac
 t of high-energy particles from background radioactivity. These events
  result in a significant number of energetic phonons that travel effic
 iently throughout the substrate and generate quasiparticles when they 
 impinge on the qubits. I will describe experiments measuring correlate
 d phonon-mediated quasiparticle poisoning in multi-qubit chips in the 
 aftermath of high-energy particle impacts\, as well as numerical model
 ing of the phonon and quasiparticle dynamics. In addition\, I will dis
 cuss strategies for protecting qubits from these poisoning effects for
  the implementation of future fault-tolerant quantum processors.
URL:https://www.physics.wisc.edu/events/?id=8687
END:VEVENT
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