Open-system spin transport and operator weight dissipation in spin chains

Abstract

We use non-equilibrium steady states to study the effect of dissipation-assisted operator evolution (DAOE) on the scaling behavior of transport in one-dimensional spin chains. We consider three models in the XXZ family: the XXZ model with staggered anisotropy, which is chaotic; XXZ model with no external field and tunable interaction, which is Bethe ansatz integrable and (in the zero interaction limit) free fermion integrable; and the disordered XY model, which is free-fermion integrable and Anderson localized. We find evidence that DAOE's effect on transport is controlled by its effect on the system's conserved quantities. To the extent that DAOE preserves those symmetries, it preserves the scaling of the system's transport properties; to the extent it breaks those conserved quantities, it pushes the system towards diffusive scaling of transport.

Published version, 14+5 pages, 11+5 figures

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Cited by in corpus (4)

• The operator growth hypothesis in open quantum systems
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• Problem-tailored Simulation of Energy Transport on Noisy Quantum Computers
• Singular transport in non-equilibrium strongly internal-coupled 1D tilted field spin-1/2 chain