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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-6639
DTSTART:20210921T190000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T193127Z
LAST-MODIFIED:20210920T131524Z
LOCATION:Zoom: https://uwmadison.zoom.us/j/92504329607?pwd=MGtOVm1NZEh
 UVW1TZ09RYUlCS0NEUT09
SUMMARY:Correlated Charge Noise and Relaxation Errors in Superconducti
 ng Qubits\, Thesis Defense\, Chris Wilen\, Physics PhD Graduate Studen
 t
DESCRIPTION:A crucial requirement to the surface code is that errors c
 annot be correlated. Here\, we characterize a superconducting multiqub
 it circuit and find that charge fluctuations are highly correlated on 
 a length scale over 600~μm\; moreover\, discrete charge jumps are acc
 ompanied by a strong transient suppression of qubit energy relaxation 
 time across the millimeter-scale chip. The resulting correlated errors
  are explained in terms of the charging event and phonon-mediated quas
 iparticle poisoning associated with absorption of gamma rays and cosmi
 c-ray muons in the qubit substrate. Robust quantum error correction wi
 ll require the development of mitigation strategies to protect multiqu
 bit arrays from correlated errors due to particle impacts.
URL:https://www.physics.wisc.edu/events/?id=6639
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