[Crib-list] CRIBB Seminar -- Speaker: Rahul Sahay (Harvard) - Friday, January 5, 2024 @ 12:00 Noon - 1:00 PM -- via ZOOM

[Shirley Entzminger]

                           VIRTUAL Seminar...


           COMPUTATIONAL RESEARCH in BOSTON and BEYOND SEMINAR
                               (CRIBB)


   ZOOM meeting info...

                    https://mit.zoom.us/j/96155042770

                    Meeting ID: 961 5504 2770

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DATE:	Friday, January 5, 2024

TIME:	12:00 Noon - 1:00 PM  (Eastern Standard Time)

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SPEAKER:  Rahul Sahay  (Harvard)

TITLE: Quantum Spin Lakes: Non-Equilibrium Spin Liquids for Near-Term 
Quantum Devices

ABSTRACT::

Dynamical parameter sweeps are ubiquitously used for exploring ground 
state phase diagrams in analog quantum simulators. However, conventional 
lore dictates that the presence of unavoidable quantum phase 
transitions---at which a time-evolving quantum system falls out of 
equilibrium---limits the ability of these sweeps to prepare interesting 
equilibrium ground states. In this talk, we counter this lore and show 
that there are situations where the non-equilibrium nature of a 
dynamical sweep can enable the creation of exotic states of matter, even 
in the absence of the desired ground states. For instance, we highlight 
a non-equilibrium mechanism wherein a simple Hamiltonian parameter sweep 
can project out anyons and prepare quantum spin liquid (QSL) states, 
despite the ground state of the Hamiltonian failing to be a QSL. We show 
that this mechanism sheds light on recent experimental and numerical 
observations of the dynamical state preparation of the ruby lattice spin 
liquid in Rydberg atom arrays. Moreover, this theory suggests a tree 
tensor network-based numerical tool that quantitatively reproduces the 
experimental data two orders of magnitude faster than conventional 
brute-force simulation methods. Time permitting, we highlight that even 
spin liquid states that are unstable in equilibrium---namely, 2 + 1D 
U(1) spin liquid states---become accessible by such non-equilibrium
dynamics.

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     https://math.mit.edu/crib/

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Shirley Entzminger
Administrative Assistant II
MIT - Math Dept.
77 Massachusetts Avenue
Building 2, Room 350A
Cambridge, MA  02139
PHONE:  617-253-4994
EMAIL:  daisymae at math.mit.edu
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