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SEQUENCE:1
UID:UW-Physics-Event-6559
DTSTART:20210823T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T192230Z
LAST-MODIFIED:20210816T135602Z
LOCATION:Zoom link below
SUMMARY:Coherent and cavity-based measurement of two-particle states\,
  Thesis Defense\, Joelle Corrigan\, Physics PhD Graduate Student
DESCRIPTION:With their small footprint and compatibility with industry
  fabrication techniques\, semiconducting quantum dots have shown great
  potential as a platform for quantum computing.Though one of the most 
 basic qubit implementations requires only a single electron within one
  quantum dot\, many other platforms or readout schemes involve couplin
 g between multiple quantum dots and differentiating between two-partic
 le\, singlet-triplet states. In silicon or Si/SiGe systems\, the most 
 basic singlet-triplet splitting depends on the valley state\, which is
  much lower than the quantum dot’s potential-defined orbital state a
 nd can vary widely based on dot confinement and position (typically 5-
 40GHz). In this talk I first introduce a tunable latched readout schem
 e and demonstrate its use in charge-mapped readout of the quantum dot 
 hybrid qubit. This scheme is then used to characterize a series of two
 -particle states using both Rabi and Ramsey pulsing\, revealing 8 diff
 erent transitions below 10GHz. The presence of these low energy levels
  is explained by considering electron-electron interactions within the
  system\, and the data are fit using a six-level Hamiltonian. The last
  part of the talk will focus on a 3D integrated resonator-dot system. 
 Driving the double-quantum-dot detuning at the cavity frequency reveal
 s an enhanced coupling response of the cavity to the double-quantum-do
 t tunneling transition. This response is fit to using theory for a mod
 ulated longitudinal coupling between the dots and the cavity to good a
 greement. Finally\, fast dc pulses are used to probe the singlet-tripl
 et splitting in the system by populating excited states in the quantum
  dot.
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\nJoin Zoom Meeting
\nhttps://uwmadison.zoom.us/j/4083305280?
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\nMeeting ID: 408 330 5280
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 asscode: qubit
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URL:https://www.physics.wisc.edu/events/?id=6559
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