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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-9464
DTSTART:20251103T183000Z
DTEND:20251103T200000Z
DTSTAMP:20260413T084150Z
LAST-MODIFIED:20251014T205519Z
LOCATION:Chamberlin Hall Room 5310
SUMMARY:Direct measurement of the energy spectrum of a quantum dot art
 ificial molecule\, Preliminary Exam\, Jack Reily
DESCRIPTION:Quantum dot artificial atoms in semiconducting SiGe/Si/SiG
 e heterostructures\, formed by strong electronic confinement\, are pro
 mising scalable qubit systems. The single- and few-electron spectra co
 nsist of multiple valley-orbital levels\, which\, in general\, modify 
 tunnel couplings and qubit dynamics\, which is relevant for qubit enco
 ding and readout. Here\, we provide a new method of directly measuring
  the energy spectrum of an artificial molecule for fixed electron numb
 er. By tuning square wave pulses along the delta axis of the artificia
 l molecule\, we show how the curvature governed by excited-to-excited\
 , ground-to-excited\, and ground-to-ground couplings can all be extrac
 ted simultaneously. This new measurement provides the ability to extra
 ct many relevant Hamiltonian parameters\, which are necessary for the 
 precise operation and control of spin qubits.
URL:https://www.physics.wisc.edu/events/?id=9464
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