Cornell University

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Quantum Theory Seminar - Quantum Spin Lakes: NISQ-Era Spin Liquids from Non-Equilibrium Dynamics - Rahul Sahay (Harvard University)

Friday, April 14, 2023 at 3:30pm to 4:30pm

Virtual Event

Abstract:  While many-body quantum systems can in principle host exotic quantum spin liquid (QSL) states, realizing them as ground states in experiments can be prohibitively difficult. In this talk, we show how non-equilibrium dynamics can provide a streamlined route toward creating QSLs. In particular, we show how a simple Hamiltonian parameter sweep can dynamically project out condensed anyons from a family of initial product states, yielding a QSL-like state. We christen such states "quantum spin lakes" which, while not thermodynamically large QSLs, enable their study in NISQ-era quantum simulators. Indeed, 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. Time permitting, we will discuss how our theory motivates a tree tensor network-based numerical tool---reliant on our theory---that quantitatively reproduces the experimental data two orders of magnitude faster than conventional brute-force simulation methods. Finally, we will highlight that even spin liquid states that are unstable in equilibrium---namely, 2 + 1D U(1) spin liquid states---can be robustly prepared by non-equilibrium dynamics.

Faculty Hosts: Chao-Mian Jian, and Debanjan Chowdhury

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University Themes



physics, lassp, quantum_site, quantum_theory, quantum_lassp




#LASSP, Quantum_site, Quantum_theory, Physics

Contact E-Mail


Dr. Rahul Sahay

Speaker Affiliation

Harvard Univeristy

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Open to the public

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