Entanglement and majorization in (1+1)-dimensional quantum systems

Details Entanglement and majorization in (1+1)-dimensional quantum systems Entanglement and majorization in (1+1)-dimensional quantum systems

2005-01-20

arxiv.org/abs/quant-ph/0501110v3

Phys.Rev.A71:052327,2005; Erratum-ibid.A73:019904,2006

Physics

Quantum Physics

8 pages, 1 figure, corrected an error in the theorems from sec.III and IV

Scientific paper

10.1103/PhysRevA.71.052327 10.11

Motivated by the idea of entanglement loss along Renormalization Group flows, analytical majorization relations are proven for the ground state of (1+1)-dimensional conformal field theories. For any of these theories, majorization is proven to hold in the spectrum of the reduced density matrices in a bipartite system when changing the size L of one of the subsystems. Continuous majorization along uniparametric flows is also proven as long as part of the conformal structure is preserved under the deformation and some monotonicity conditions hold as well. As particular examples of our derivations, we study the cases of the XX, Heisenberg and XY quantum spin chains. Our results provide in a rigorous way explicit proves for all the majorization conjectures raised by Latorre, Lutken, Rico, Vidal and Kitaev in previous papers on quantum spin chains.

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