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Events During the Week of May 4th through May 11th, 2025
Sunday, May 4th, 2025: Academic Calendar; Exams; Abstract: *Note: actual end time may vary.*; Add this event to your calendar
Monday, May 5th, 2025: Academic Calendar; Exams; Abstract: *Note: actual end time may vary.*; Add this event to your calendar
Tuesday, May 6th, 2025: Academic Calendar; Exams; Abstract: *Note: actual end time may vary.*; Add this event to your calendar; Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar; Toward understanding supranuclear-density matter with gravitational waves; Time: 2:00 pm; Place: Join Zoom Meeting: Meeting ID: 965 9696 7335; Speaker: Koutarou Kyutoku , Chiba University; Abstract: Properties of supranuclear-density matter governed by quantum chromodynamics (QCD) are yet to be understood. One of the most important problems is how hadronic matter transitions to quark matter as the density increases. Neutron stars serve as a natural laboratory to solve these problems, and gravitational waves emitted by binary neutron stars are among the promising tools. In particular, post merger gravitational waves will tell us about the densest matter in the universe. In this talk, after briefly reviewing current constraints on the equation of state, I will discuss future prospects for understanding QCD phase structure mainly based on our numerical-relativity simulations.

NOTE: All participants and hosts are now required to sign into a Zoom account prior to joining meetings hosted by UC Berkeley.; Host: Baha Balantekin; Add this event to your calendar; 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.; Add this event to your calendar; M.S. In Physics – Quantum Computing Event; Research Flash Presentation: Device Fabrication for Visualizing 2D Magnetism with Scanning Tunneling Microscopy and Spectroscopy; Time: 4:00 pm - 4:15 pm; Place: 5280 Chamberlin Hall; Speaker: Siwei Wang, M.S. in Physics - Quantum Computing, UW-Madison; Abstract: Scanning Tunneling Microscopy (STM) and Spectroscopy (STS) are promising techniques to visualize magnetism in 2D material with high spatial resolution. The atomic resolution of STM/STS has demanded an atomically clean surface for measurement. Fabricating atomically clean devices with the air-and photo- sensitive CrI3 2D magnet has been the bottleneck ever since the project’s perception. Techniques such as tip cleaning and annealing are able push out the bubbles, polymers and other defects generated in the fabrication process. In this talk I will discuss the efforts towards developing parameters for these techniques on the atomic force microscope and anneal chamber.; Attachments: Siwei Wang Presentation Poster.pdf; Add this event to your calendar
Wednesday, May 7th, 2025: Academic Calendar; Exams; Abstract: *Note: actual end time may vary.*; Add this event to your calendar; Thesis Defense; Search for dark matter recoiling from pencil-thin jets using CMS data with machine learning techniques; Time: 10:00 am - 12:00 pm; Place: 5280 CH; Speaker: Abhishikth Mallampalli, Physics PhD student; Abstract: The Standard Model (SM) of particle physics serves as the foundational framework describing the fundamental particles and forces that govern the behavior of matter and radiation in the universe, excluding gravity. It provides a comprehensive theory of the electromagnetic, weak, and strong nuclear interactions—three of the four fundamental forces of nature. Despite its incredible success in explaining a vast range of experimental phenomena, it is still incomplete and there are several open questions. This thesis attempts to answer some of these open questions in physics today.

Several new physics models predict particles that are expected to leave signatures of missing transverse momentum in collider experiments. One of the primary motivations for such searches is the astrophysical evidence for dark matter, including galactic rotation curves, gravitational lensing, and observations of the cosmic microwave background. Weakly Interacting Massive Particles (WIMPs) are a leading candidate for dark matter, and this thesis explores the parameter space of two WIMP-inspired models, setting stringent limits on their viability. In addition, searches for extra spacetime dimensions, leptoquarks, and quantum blackholes are also performed. Machine learning techniques are used for these searches.

This thesis also presents an algorithm to mitigate beam-induced background in a future muon collider using fast machine learning; Host: Sridhara Dasu; Add this event to your calendar; Preliminary Exam; Tunable control and readout of quantum dot hybrid qubits; Time: 3:00 pm - 5:00 pm; Place: Chamberlin Hall Room 5310; Speaker: Jared Benson; Abstract: In this talk, I will discuss three projects that utilize the tunability of the semiconductor quantum dot platform to enhance the characteristics of the quantum dot hybrid qubit (QDHQ). The first project involves the use of dynamic tunnel rate control and latched readout to enable single-shot readout and coherent manipulation of the QDHQ. Next, I will present a method in which we use near-infrared illumination in the presence of applied gate biases to tune the device operating voltages to be smaller and more uniform. Last, I will outline our ongoing efforts to demonstrate a QDHQ with hole spins instead of electron spins, which offers a tunable qubit energy splitting that can be adjusted by changing the confinement of the quantum dots. These projects represent meaningful steps towards the first experimental realization of a two-qubit interaction between quantum dot hybrid qubits.; Host: Mark Alan Eriksson; Add this event to your calendar; Thesis Defense; IMPLEMENTATION OF QUANTUM ALGORITHMS WITH NEUTRAL ATOM ARRAYS; Time: 3:00 pm - 5:00 pm; Place: 5280 CH; Speaker: Cody Poole, Physics PhD Student; Abstract: Quantum computers promise to eventually provide significant algorithmic advantage over classical computers for a variety of problems. Executing algorithms on a physical device requires compiling circuits to the native gate set of your device. We are in the Noisy Intermediate Scale Quantum (NISQ) era of quantum computers where circuit execution depths are severely limited by qubit decoherence and gate errors. Large defect-free atom arrays can be produced by initially loading into traps with ~50% success and rearranging the trapped atoms into a desired pattern to enable enhanced data rates for calibrating control operations and running circuits. We present on our implementation of defect-free array generation using the Hungarian matching algorithm and on a partially parallelized rearrangement algorithm. Quantum computers based on a register of neutral Cs atoms have demonstrated significant improvements in gate fidelities in recent years. We present the first implementation of quantum algorithms on an array of neutral Cs atoms. Algorithms executed include Greenberger-Horne-Zeilinger state preparation, Quantum Phase Estimation of the ground state energy of the Hydrogen molecule, the Quantum Approximate Optimization Algorithm (QAOA) applied to the MAXCUT problem, and the Variational Quantum Eigensolver algorithm applied to finding the ground state energy of the Lipkin model. Looking to the future, high performance quantum error correction (QEC) codes will eventually be necessary to run very deep circuits that promise to eventually provide quantum advantage. We present on a qubit allocation scheme and Rydberg gate protocol that would allow for the implementation of a recently characterized class of quantum QEC codes known as Bivariate Bicycle codes on a 2D array of Cs qubits.; Host: Mark Saffman; Add this event to your calendar
Thursday, May 8th, 2025: Academic Calendar; Exams; Abstract: *Note: actual end time may vary.*; Add this event to your calendar; R. G. Herb Condensed Matter Seminar; Mott insulators with boundary zeros; Time: 10:00 am - 6:00 pm; Place: 5310 Chamberlin; Speaker: Giorgio Sangiovanni, Wuerzburg; Abstract: In the recent literature, the concept of topological Mott insulator has been spelled out in rather different ways. Due to the intrinsic many-body nature, a comprehensive classification is challenging to formulate. In this talk I will discuss a novel, remarkably simple way of describing topological Mott insulators based on the momentum dispersion of single-particle Green's function zeros. After focusing on the fate of the bulk-boundary correspondence, I will propose a way of revealing the physical consequences of the boundary zeros based on the hybridization with conventional topologically protected edge modes. In the final part of the talk I will give an intepretation in terms of fractionalized electrons and boundary spinons of a U(1) gapped spin liquid phase. References N. Wagner, et al. Mott insulators with boundary zeros. Nat Commun 14, 7531 (2023). N. Wagner, et al. Edge Zeros and Boundary Spinons in Topological Mott Insulators. Phys. Rev. Lett. 133, 126504 (2024).; Host: Elio Konig; Add this event to your calendar
Friday, May 9th, 2025: Academic Calendar; Exams; Abstract: *Note: actual end time may vary.*; Add this event to your calendar; Physics Graduation Ceremony; Time: 3:00 pm - 5:00 pm; Place: 2241 Chamberlin; Speaker: various; Host: Evan Heintz & Sharon Kahn; Add this event to your calendar; Academic Calendar; Graduate School Spring 2025: Master's degree deadline; Time: 4:30 pm - 5:30 pm; Abstract: CONTACT: 262-2433, gsacserv@grad.wisc.edu URL:; Add this event to your calendar; Academic Calendar; Graduate School Spring 2025: Master's degree deadline; Time: 4:30 pm - 5:30 pm; Abstract: CONTACT: 262-2433, gsacserv@grad.wisc.edu URL:; Add this event to your calendar; Academic Calendar; Spring 2025 Commencement; Time: 5:30 pm - 12:00 am; Abstract: Doctoral, MFA, and Medical Professional Degree Candidate Ceremony. URL:; Add this event to your calendar
Saturday, May 10th, 2025: Academic Calendar; Spring 2025 Commencement; Time: 12:30 pm - 12:00 am; Abstract: Bachelor’s, Law, and Master’s Degree Candidate Ceremony. URL:; Add this event to your calendar
Sunday, May 11th, 2025: Academic Calendar; Graduate School Spring 2025: Doctoral degree deadline; Time: 11:55 pm - 12:55 am; Abstract: CONTACT: 262-2433, gsacserv@grad.wisc.edu; Add this event to your calendar

Events During the Week of May 4th through May 11th, 2025