Events

Wisconsin Quantum Institute

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Events During the Week of February 13th through February 20th, 2022

Monday, February 14th, 2022

No events scheduled

Tuesday, February 15th, 2022

Quantum randomness: from chaos to quantum computing
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Bin Yan, Los Alamos National Laboratory
Abstract: The development of quantum technologies has now become a global race owing to its great promise to revolutionize our ability for information processing. On the other hand, the influence of quantum information science has concurrently penetrated into research areas of fundamental physics as well. In this talk, I will thus focus on a topic at the interface between Physics and Quantum Information. Specifically, I will present our approach to the study of quantum chaos from a quantum information point-of-view, and explore the implications of chaotic dynamics on the performance of quantum machine learning. Notably, quantum chaos is of fundamental interest and is crucial for answering several key questions in condensed matter physics, e.g., thermalization in isolated many-body systems. Similarly, quantum machine learning offers an appealing synergistic approach for combining and utilizing the potentials of machine learning and quantum computers. The interplay between these fields demonstrates how technical toolkits developed in Quantum Information can be applied to study problems in Physics, and vice versa insight from physics can strengthen our understanding of the limitations of quantum information processing. I will conclude this talk with a discussion about several relevant ongoing and future directions, including quantum networking and quantum correlations in quantum material.
Host: Robert McDermott
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Wednesday, February 16th, 2022

No events scheduled

Thursday, February 17th, 2022

Tuning dipolar interactions between molecules for novel dynamics
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Jun-Ru Li, JILA, NIST and University of Colorado, Boulder
Abstract: Ultracold polar molecules possess rich internal structure and support dipolar interactions, bringing new opportunities for studying quantum phenomena. Complete control of molecular quantum systems has long been hindered by chemical reactions. In this talk, I will describe results emerging from our recent implementation of exquisite control of the molecular interaction processes. By using an electric field-induced shielding resonance, we suppress the two-body reactive loss in a three-dimensional gas by a factor of 30 while preserving the strong dipolar elastic collisions. In a quasi-two-dimensional geometry where the molecular motion is constrained, we demonstrate that such loss is suppressed by aligning dipoles perpendicular to the plane of motion and exploiting the repulsive channel of the dipolar interactions. Implementing these techniques brings molecular gases into a new regime where elastic collisions dominate, leading to rapid dipolar thermalization and direct evaporative cooling to quantum degeneracy. A feature of the dipolar interaction is its long interaction range. Recently, we have created a stack of two-dimensional layers of molecules where we can control the states of the molecules in each individual layer. We directly observed and controlled interactions between molecules in and between these isolated layers. These research results have brought molecular control to a new regime, highlighting the promise of ultracold molecular gases as a new platform for quantum science.
Host: Mark Saffman
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Friday, February 18th, 2022

The key symmetries of superconductivity
Time: 3:30 pm
Place: 2241 Chamberlin Hall
Speaker: Daniel Agterberg, UW-Milwaukee
Abstract: Research in superconductivity has intensified recently, fueled by the promise of new quantum Majorana particles. Key to this are the symmetries of the superconducting state. In this talk, I will discuss the central role of time-reversal and inversion symmetries in stabilizing superconductivity and the unusual physical properties that arise when these symmetries are broken. The emphasis will be on the nature of the two-electron bound states, that is the Cooper pairs, that underlie superconductivity.
Host: Alex Levchenko
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