Destructive Interference induced constraints in Floquet systems

TL;DR

This paper introduces a new approach using destructive quantum interference to create prethermal, kinetically constrained dynamics in Floquet systems, leading to Hilbert space fragmentation and potential quantum information localization.

Contribution

It presents a novel paradigm leveraging destructive interference to induce constraints and fragmentation in Floquet systems, unifying various driven system behaviors.

Findings

Constructed a 1D interacting spin model with Hilbert space fragmentation

Demonstrated initial states with localized quantum information

Showed constraints depend on drive frequency and interference processes

Abstract

We introduce the paradigm of destructive many-body interference between quantum trajectories as a means to systematically generate prethermal kinetically constrained dynamics in Floquet systems driven at special frequencies. Depending on the processes that are suppressed by interference, the constraint may or may not be associated with an emergent global conservation; the latter kind having no mechanism of generation in time-independent settings. As an example, we construct an one-dimensional interacting spin model exhibiting strong Hilbert space fragmentation with and without dipole moment conservation, depending on the drive frequency. By probing the spatiotemporal profile of the out-of-time-ordered correlator, we show that this model, in particular, has initial states in which quantum information can be spatially localized - a useful feature in the field of quantum technologies. Our paradigm unifies various types of Hilbert space fragmentation that can be realized in driven systems.