Realizing a dynamical topological phase in a trapped-ion quantum processor

Realizing a dynamical topological phase in a trapped-ion quantum processor
Romain Vasseur, Physics Dept., UMass, Amherst
Romain Vasseur
Date and time: Thu, Oct 06, 2022 - 11:30am
Refreshments at 11:15am
Location: LGRT 1033
Category: Condensed Matter Seminar
Abstract:

Nascent platforms for programmable quantum simulation offer unprecedented access to new regimes of far-from-equilibrium quantum many-body dynamics in almost isolated systems. In this talk, I will discuss a new type of non-equilibrium topological phase in quasi-periodically driven spin chains that exhibits topological edge states that are protected purely by emergent dynamical symmetries, and that cannot be broken by microscopic perturbations. This is in sharp contrast with topological phases in thermal equilibrium, where 1d bosonic systems (e.g. spin- or qubit- chains) cannot support intrinsically topological phases without symmetry protection. I will discuss an experimental realization of this phase in Quantinuum’s System Model H1 trapped-ion quantum processor, and comment on the role of coherent and incoherent errors. In particular, I will argue that the quasiperiodic drive is crucial to realize topological edge states robust to arbitrary perturbations: the analogous edge states of a periodically driven qubit array are vulnerable to symmetry-breaking errors and quickly decohere.