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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-8353
DTSTART:20230706T160000Z
DTEND:20230706T180000Z
DTSTAMP:20260414T033138Z
LAST-MODIFIED:20230628T142734Z
LOCATION:5280 Chamberlin
SUMMARY:Toward implementation of protected charge-parity qubits\, Grad
 uate Program Event\, Abigail Shearrow\, Department of Physics Graduate
  Student
DESCRIPTION:Topologically protected qubits are an area of growing inte
 rest and active research\, with the potential for orders-of-magnitude 
 improvements in coherence compared to conventional qubits. One such pr
 otected qubit is the charge-parity (C-parity) qubit\, which consists o
 f a pi-periodic Josephson element shunted by a large capacitance. Here
 \, we implement imperfect pi-elements as "plaquettes" consisting of tw
 o arms in parallel\, each arm incorporating a small-area Josephson jun
 ction in series with a large inductor. When the plaquette is biased at
  half a flux quantum\, the first harmonic of the Josephson energy is s
 uppressed and the second harmonic\, which is proportional to cos(2φ)\
 , remains. While individual plaquettes are not protected\, protection 
 scales exponentially with the number of plaquettes concatenated in ser
 ies. In this talk we describe the design\, fabrication\, and character
 ization of plaquette devices.
URL:https://www.physics.wisc.edu/events/?id=8353
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