On reduced density matrices for disjoint subsystems

Details On reduced density matrices for disjoint subsystems On reduced density matrices for disjoint subsystems

2009-10-29

arxiv.org/abs/0910.5671v1

EPL 89, 40001 (2010)

Physics

Condensed Matter

Statistical Mechanics

10 pages, 4 figures

Scientific paper

We show that spin and fermion representations for solvable quantum chains
lead in general to different reduced density matrices if the subsystem is not
singly connected. We study the effect for two sites in XX and XY chains as well
as for sublattices in XX and transverse Ising chains.

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