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Thermal States as Convex Combinations of Matrix Product States (1709.07423v3)
Published 21 Sep 2017 in quant-ph, cond-mat.stat-mech, and cond-mat.str-el
Abstract: We study thermal states of strongly interacting quantum spin chains and prove that those can be represented in terms of convex combinations of matrix product states. Apart from revealing new features of the entanglement structure of Gibbs states our results provide a theoretical justification for the use of White's algorithm of minimally entangled typical thermal states. Furthermore, we shed new light on time dependent matrix product state algorithms which yield hydrodynamical descriptions of the underlying dynamics.
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