Physics Department Colloquia

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Events During the Week of February 18th through February 25th, 2024

Monday, February 19th, 2024

No events scheduled

Tuesday, February 20th, 2024

No events scheduled

Wednesday, February 21st, 2024

No events scheduled

Thursday, February 22nd, 2024

Exploring many-body problems with arrays of individual atoms
Time: 3:30 pm - 5:00 pm
Place: Discovery Building, DeLuca Forum
Speaker: Antoine Browaeys, Laboratoire Charles Fabry, Institut d’Optique, CNRS

Over the last twenty years, physicists have learned to manipulate individual quantum objects: atoms, ions, molecules, quantum circuits, electronic spins... It is now possible to build "atom by atom" a synthetic quantum matter. By controlling the interactions between atoms, one can study the properties of these elementary many-body systems: quantum magnetism, transport of excitations, superconductivity... and thus understand more deeply the N-body problem. More recently, it was realized that these quantum machines may find applications in the industry, such as finding the solution of combinatorial optimization problems.

This seminar will present an example of a synthetic quantum system, based on laser-cooled ensembles of individual atoms trapped in microscopic optical tweezer arrays. By exciting the atoms into Rydberg states, we make them interact, even at distances of more than ten micrometers. In this way, we study the magnetic properties of an ensemble of more than a hundred interacting ½ spins, in a regime in which simulations by usual numerical methods are already very challenging. Some aspects of this research led to the creation of a startup, Pasqal.

This event starts at 3:30pm with refreshments, followed at 3:45pm by a short presentation by Atharva Vidwans (MSPQC student Micheline Soley group) titled "qDRIVE: A Variational Quantum Eigensolver for Resonance Identification on Near-Term Computers". The invited presentation starts at 4pm.

Host: Mark Saffman
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Friday, February 23rd, 2024

Symmetry in Quantum Field Theory
Time: 3:30 pm - 5:00 pm
Place: Chamberlin 2241
Speaker: Clay Córdova, University of Chicago
Abstract: Symmetry is a powerful mathematical tool for organizing physical phenomena and anchors our understanding of the laws of nature. Over the past century, the theory of symmetry has evolved in parallel with quantum physics and has become fundamentally intertwined with quantum field theory and topology. Recently, new generalized concepts of symmetry have been developed and rekindled a longstanding hope for a classification of phases of field theories based on patterns of symmetry realization in the vacuum. These novel symmetries may also play a role in addressing long-standing mysteries of particle physics, such as hierarchies in the masses and couplings of elementary particles. I will survey these developments and applications.
Host: Gary Shiu
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