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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:3
UID:UW-Physics-Event-8847
DTSTART:20241017T150000Z
DTEND:20241017T230000Z
DTSTAMP:20260413T171612Z
LAST-MODIFIED:20241015T184329Z
LOCATION:5310 Chamberlin
SUMMARY:An Electron Linear Accelerator for On-Demand Qubit Irradiation
 \, R. G. Herb Condensed Matter Seminar\, Thomas McJunkin\, Johns Hopki
 ns University
DESCRIPTION:Superconducting transmon qubits are known to be susceptibl
 e to errors due to ionizing radiation from ambient radioactive decay a
 nd cosmic ray sources (muons). In this talk\, I'll present an electron
  linear accelerator (linac) as an on-demand high-energy particle sourc
 e to study deleterious effects on a multi-qubit transmon system. The l
 inac provides a pulsed\, microsecond burst of ~20 MeV electrons that a
 re redirected at a modified dilution refrigerator. I'll show how singl
 e electron collisions with the quantum chip mimic the energy depositio
 n from a typical cosmic ray muon and cause correlated qubit errors. Th
 e error dynamics of individual qubits and the system as a whole can be
  easily and quickly extracted due to the on-demand nature of our radia
 tion source. Though radiation-induced quasiparticle tunneling primaril
 y results in transient relaxation errors\, this experimental scheme al
 so reveals excitation and frequency detuning errors. I'll also present
  differences in error behavior due to qubit design and state preparati
 on. This new facility provides a testbed for novel qubit design and pa
 ckaging techniques for radiation-induced error mitigation.
URL:https://www.physics.wisc.edu/events/?id=8847
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