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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-8528
DTSTART:20231213T213000Z
DTEND:20231213T233000Z
DTSTAMP:20260414T025138Z
LAST-MODIFIED:20231213T141301Z
LOCATION:B343 Sterling
SUMMARY:Investigation of oxide defects and heterostructure modificatio
 ns for use in quantum computing\, Preliminary Exam\, Emily Joseph\, Ph
 ysics PhD Graduate Student
DESCRIPTION:Si/SiGe quantum dots are attractive candidates for quantum
  computation yet there are significant challenges to overcome in an ef
 fort to improve the scalability of the system. These devices are susce
 ptible to charge noise\, some of which may arise from two-level system
 s (TLS) in the oxide. In this work we use resonator measurement and ST
 EM images to investigate ALD oxide quality to improve semiconducting q
 ubits. Another challenge inherent to Si/SiGe quantum dots is the energ
 y splitting of the conduction band valley states. The valley splitting
  in Si devices is largely variable and unpredictable and it would be a
 dvantageous to be able to predictably rely on a designed-in valley spl
 itting. A modification to the heterostructure has been produced with o
 scillating concentration of Ge through the quantum well\, called the W
 iggle Well. Theory predicts that this structure will show strong spin-
 orbit coupling and with shear strain can have a deterministically larg
 e valley splitting. Here we describe methods for mechanically introduc
 ing shear strain into the quantum well and a proposed experiment measu
 ring the spin-orbit coupling of the Wiggle Well and making a Loss-DiVi
 ncenzo qubit without a micromagnet.
URL:https://www.physics.wisc.edu/events/?id=8528
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