Event Details

In this talk, I will discuss new perspectives on many-body dynamics based on quantum information. Under unitary time evolution, information about a single spin gradually spreads out in space, and an effective light cone naturally emerges as an intrinsic property of the time evolution operator. Based on this picture, I will present a low-cost tensor network method that can accurately capture the shape of the causal light cone for generic 1D systems of hundreds of spins, a regime that was previously beyond reach. Using the method, we identify a new dynamical phase, characterized by a power-law-like causal light cone. Signatures of this new phase have already been observed in recent ultracold atom experiments on interacting quasi-periodic systems.