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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-6161
DTSTART:20201027T200000Z
DURATION:PT1H0M0S
DTSTAMP:20260415T023608Z
LAST-MODIFIED:20201021T141855Z
LOCATION:https://uwmadison.zoom.us/j/92446624828
SUMMARY:Circuit Quantum Electrodynamics with Si/SiGe Quantum Dots\, Th
 esis Defense\, Nathan Holman\, Physics PhD Graduate Student
DESCRIPTION:In this talk I present an approach to engineering quantum 
 mechanical circuits utilizing superconducting resonators and Si/SiGe q
 uantum dots in a cQED framework as a basis for quantum computing techn
 ology. I will discuss the microwave engineering principles for the qua
 ntum dot wiring to nearly eliminate unintended resonator photon leakag
 e out the dot leads without the use of on chip lumped element LC filte
 rs. Using this approach\, quality factors as high as 30k have been ach
 ieved and are limited by the intentional coupling of the resonator to 
 the readout lead. Next\, I discuss the development and characterizatio
 n of a novel growth technique for an ultrathin (< 2 nm) and high quali
 ty SiO2 gate dielectric aimed at reducing charge noise. As a demonstra
 tion of improved charge coherence\, I will show low frequency (< 500 M
 Hz) Landau-Zener-Stückelberg-Majorana interferometry experiments of a
  dressed valley-orbit state. Lastly\, I will present ongoing efforts t
 o further improve device performance and reproducibility by decoupling
  the fabrication of the quantum dots and resonators using a multi-chip
  module architecture. Preliminary measurements of a double and triple 
 quantum dots coupled to an off chip\, high impedance TiN resonator wil
 l be shown.
URL:https://www.physics.wisc.edu/events/?id=6161
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