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Events During the Week of June 30th through July 7th, 2024

Monday, July 1st, 2024

Preliminary Exam
Tuning Techniques for Si/SiGe Quantum Dot Qubit Devices
Time: 4:00 pm - 6:00 pm
Place: 5310 Chamberlin Hall;
Speaker: Sanghyeok Park, Physics PhD Graduate Student
Abstract: In this talk, I delve into the physics of quantum bits (qubits) within semiconductor quantum dot devices and explore how their tunability enhances their potential for quantum computing applications. I will discuss two distinct projects centered on the tunability of Si/SiGe quantum dot devices: (i) single-shot latched readout of a quantum dot hybrid qubit (QDHQ) using barrier gate pulsing, and (ii) lowering and controlling qubit operation voltages using gate-biased illumination. In the first project, I will present single-shot measurements and demonstrate coherent Larmor oscillations of a QDHQ. I will detail several methods implemented to optimize a QDHQ for single-shot readout, a critical component for advanced quantum computing protocols. These methods include a barrier gate pulsing technique that dynamically controls quantum dot tunnel rates to facilitate the qubit latched readout process. In the second project, I will introduce a technique for adjusting the operating voltages of a quantum dot device. This approach leverages near infra-red light illumination in the presence of applied voltages to modify the trapped charges under the gates, enabling tuning of the trapped charges to change the operating points. By using this technique, sub-100 mV tuning across all gates in the (1,1,1) charge configuration for qubit operation of the triple quantum dot device is achieved. This work with Si/SiGe quantum dot devices provides a promising step towards the realization of scalable and tunable quantum processors.
Host: Mark Eriksson
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Tuesday, July 2nd, 2024

Wisconsin Quantum Institute
Quantum Coffee Hour
Time: 3:00 pm - 4:00 pm
Place: Rm.5294, Chamberlin Hall
Abstract: Please join us for the WQI Quantum Coffee today at 3PM in the Physics Faculty Lounge (Rm.5294 in Chamberlin Hall). This series, which takes place approximately every other Tuesday, aims to foster a casual and collaborative atmosphere where faculty, post-docs, students, and anyone with an interest in quantum information sciences can come together. There will be coffee and treats.
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Wednesday, July 3rd, 2024

Summer Recess
Time: 12:30 pm - 1:00 pm
Place: Bascom Hill outside Birge
Speaker: Sharon Kahn
Abstract: Come take a break and play from 12:30-1 on Bascom Hill (outside of Birge)! Some of us will be walking up, leaving from the courtyard between Chamberlin and Sterling ~12:25 – feel free to walk with us!

Cornhole, ladder toss, frisbee, juice boxes. . . .
Hope you’ll join us!
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Thursday, July 4th, 2024

Academic Calendar
Independence Day observed
Abstract: *Note: actual end time may vary.* University offices closed. URL:
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Friday, July 5th, 2024

No events scheduled