Partenaires

CNRS
UPS



Rechercher

Sur ce site

Sur le Web du CNRS


Accueil du site > Publications > Publications 2008 > Comment on ’Regional versus global entanglement in resonating valence-bond states’

Comment on ’Regional versus global entanglement in resonating valence-bond states’

Fabien Alet, Daniel Braun and Grégoire Misguich

par Webmaster - 21 novembre 2008

Phys. Rev. Lett. 101, 248901 (2008)-> http://link.aps.org/doi/10.1103/PhysRevLett.101.248901] ; arXiv:0812.1932

In a recent Letter, Chandran and coworkers study the entanglement properties of valence bond states. Their main result is that valence bond states do not contain (or only an insignificant amount of) two-site entanglement, whereas they possess multi-body entanglement. Two examples ("RVB gas and liquid") are given to illustrate this claim, which essentially comes from a lower bound derived for spin correlators in valence bond states. In this Comment, we show that (i) the lower bound is equivalent to a celebrated result of Anderson, (ii) an exact analytical calculation for the "RVB gas" is possible, (iii) for the "RVB liquid" on the square lattice, the calculations of Chandran et al. are not correct and Monte Carlo simulations show that there is two-site entanglement in this case.