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Events on Friday, January 29th, 2021

Theory Seminar (High Energy/Cosmology)
A physical protocol to obtain information in quantum gravity
Time: 2:00 pm
Place: For zoom link, sign up at:
Speaker: Chandramouli Chowdhury, ICTS, Bangalore
Abstract: We consider a set of observers who live near the boundary of global AdS, and are allowed to act only with simple low-energy unitaries and make measurements in a small interval of time. The observers are not allowed to leave the near-boundary region. We describe a physical protocol that nevertheless allows these observers to obtain detailed information about the bulk state. This protocol utilizes the leading gravitational back-reaction of a bulk excitation on the metric, and also relies on the entanglement-structure of the vacuum. For low-energy states, we show how the near-boundary observers can use this protocol to completely identify the bulk state. We explain why the protocol fails completely in theories without gravity, including non-gravitational gauge theories. This provides perturbative evidence for the claim that one of the signatures of holography -- the fact that information about the bulk is also available near the boundary -- is already visible in semiclassical gravity. This is work done in collaboration with Olga Papadoulaki and Suvrat Raju, in 2008.01740.
Host: Lars Aalsma
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Atomic Physics Seminar
Quantum simulation of spin models with tunable arrays of 200 single Rydberg atoms
Time: 2:00 pm
Speaker: Thierry Lahaye, Université Paris Saclay & CNRS, Palaiseau
Abstract: In this seminar, I will present how arrays of up to 200 single atoms held in optical tweezers and made to interact by exciting them to Rydberg states are an almost ideal platform for quantum simulation of quantum magnetism. I'll first review briefly the experimental realization of such arrays, and then illustrate, with recent experiments, how we can use it simulate the behavior of Ising or XY quantum magnets.

Please note that the old VAMOS Zoom link from prior seminars will no longer work. This seminar (and future seminars) can be accessed via the links on our website ( or this new Zoom link ( ).

There will also be a post-seminar discussion session with the speaker. The discussion will take place in a separate Zoom room directly after the seminar, and all attendees are welcome to participate. (Faculty will be asked to leave after ~10-15 minutes to give students and postdocs more opportunities to interact with the speaker.)
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Department Coffee Hour
Department Coffee Hour (Virtual)
Time: 3:30 pm
Place: Virtual (see abstract for connection info)
Abstract: Topic: Department Coffee Hour
Time: Jan 29, 2021 03:30 PM Central Time (US and Canada)
Every week on Fri, until May 14, 2021, 16 occurrence(s)
Jan 29, 2021 03:30 PM
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Host: Climate and Diversity Committee
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