title: Frustration, area law, and interference in quantum spin models.
abstract: We study frustrated quantum systems from a quantum information perspective. Within this approach, we find that highly frustrated systems do not follow any general "area law" of block entanglement, while weakly frustrated ones have area laws similar to those of nonfrustrated systems away from criticality. To calculate the block entanglement in systems with degenerate ground states, typical in frustrated systems, we define a "cooling" procedure of the ground state manifold and propose a frustration degree and a method to quantify constructive and destructive interference effects of entanglement.
authors.affiliation: ICFO-Institut de Ciències Fotòniques, 08860 Castelldefels (Barcelona), Spain.
authors.forename: Aditi
authors.initials: A
authors.lastname: Sen De
authors.forename: Ujjwal
authors.initials: U
authors.lastname: Sen
authors.forename: Jacek
authors.initials: J
authors.lastname: Dziarmaga
authors.forename: Anna
authors.initials: A
authors.lastname: Sanpera
authors.forename: Maciej
authors.initials: M
authors.lastname: Lewenstein