Distinctive features of inhomogeneous spin chains

Abstract

This review presents recent developments in the study of inhomogeneous XX spin chains, highlighting results on perfect state transfer, out-of-equilibrium stationary dynamics in open systems, and entanglement and correlations in ground states. We discuss the conditions on couplings that enable perfect state transfer, examine how heat currents scale when the chains are coupled to thermal baths, explore the role of tridiagonal matrices in approximating the entanglement Hamiltonian and investigate bulk and boundary entanglement negativity and correlation decay. These findings underscore some of the distinctive physical behavior of inhomogeneous spin chains and their potential applications in quantum information and thermal transport.

21 pages. This paper is based on talks given by Luc Vinet at the 33/35 International Colloquium on Group Theoretical Methods in Physics, Cotonou, Bénin, July 2024 and at the Conference Quantissima in the Serenissima V, Venice, Italy, August 2024. v2: minor modifications to match the published version