Events on Thursday, October 17th, 2024
- R. G. Herb Condensed Matter Seminar
- An Electron Linear Accelerator for On-Demand Qubit Irradiation
- Time: 10:00 am - 6:00 pm
- Place: 5310 Chamberlin
- Speaker: Thomas McJunkin, Johns Hopkins University
- Abstract: Superconducting transmon qubits are known to be susceptible to errors due to ionizing radiation from ambient radioactive decay and cosmic ray sources (muons). In this talk, I'll present an electron linear accelerator (linac) as an on-demand high-energy particle source to study deleterious effects on a multi-qubit transmon system. The linac provides a pulsed, microsecond burst of ~20 MeV electrons that are redirected at a modified dilution refrigerator. I'll show how single electron collisions with the quantum chip mimic the energy deposition from a typical cosmic ray muon and cause correlated qubit errors. The error dynamics of individual qubits and the system as a whole can be easily and quickly extracted due to the on-demand nature of our radiation source. Though radiation-induced quasiparticle tunneling primarily results in transient relaxation errors, this experimental scheme also reveals excitation and frequency detuning errors. I'll also present differences in error behavior due to qubit design and state preparation. This new facility provides a testbed for novel qubit design and packaging techniques for radiation-induced error mitigation.
- Host: Mark Friesen
- Climate & Diversity
- L & S Lunch and Learn
- Time: 12:00 pm - 1:00 pm
- Place: Zoom
- Speaker: L&S DEI Leadership
- Abstract: How to be culturally responsive to mentoring graduate students
- Department Meeting
- Closed Department Meeting
- Time: 12:15 pm - 1:00 pm
- Place: VIRTUAL, link will be sent later.
- Speaker: Kevin Black, UW-Madison
- Closed meeting to discuss personnel matters—pursuant to Section 19.85(1)(c) of the Wisconsin Open Meetings Law Closed to all but tenured faculty
- Host: Kevin Black
- Astronomy Colloquium
- High Fidelity Spectroscopy of Exoplanet and Protoplanetary Disk Atmospheres
- Time: 2:30 pm - 3:30 pm
- Place: 4421 Sterling Hall
- Speaker: Geoffrey A. Blake, California Institute of Technology
- Abstract: The extraordinary range of conditions in protoplanetary disks drives complex patterns of atomic, molecular, and dust abundances - especially for abundant 'volatile' species such as water, carbon monoxide, and small organics that condense at different spatial locations, or 'snowlines' in the disk. The bulk composition of planets can thus vary, compared to that of their host star, depending on their origin and migration history. The latest generation of Adaptive Optics (AO)-fed infrared spectrographs now provide sufficiently high dynamic range capabilities to robustly characterize exoplanetary and protoplanetary disk atmospheres. This talk will present an overview of recent results from Keck Planet Imager and Characterizer (KPIC)-NIRSPEC studies of exoplanet/brown dwarf atmospheres and those from the JWST Infrared Spectroscopic Chemistry Survey (JDISCS) conducted with Mid-InfraRed Instrument (MIRI) IFU.
- Host: Melinda Soares-Furtado
- Wisconsin Quantum Institute Colloquium
- Quantum Computing and Quantum Security for the Financial Industry
- Time: 3:30 pm - 5:00 pm
- Place: Discovery Building, DeLuca Forum
- Speaker: Marco Pistoia, JPMorganChase
- Abstract:
The world of computing is evolving at a groundbreaking rate with quantum computing offering exponential accuracy and processing speed for solving a variety of financial use cases when compared to traditional compute strategies. On the flip side, although quantum computing has the potential to drive transformational changes across digital society, these advances in computational power will also introduce significant risks such as the disruption to widely used encryption standards. This presentation will discuss some recent results obtained by JPMorganChase in the field of quantum computing and quantum cryptography. For quantum computing, we will go over scaling advantage, random circuit sampling, some recent quantum optimization work, and the opportunity to integrate quantum computing and quantum communications for privacy in distributed machine learning. In the area of quantum cryptography and networking, we will discuss the need for building security solutions that encompass both post quantum cryptography and quantum key distribution.
This event starts at 3:30pm with refreshments, followed at 3:45pm by a short presentation titled "Facilitating Variational Quantum Algorithm Design with Reconstructed Landscapes", by Tianyi Hao (Tannu group). The invited presentation starts at 4pm.
- Host: Swamit Tannu