Multipartite Entanglement Signature of Quantum Phase Transitions

Details Multipartite Entanglement Signature of Quantum Phase Transitions Multipartite Entanglement Signature of Quantum Phase Transitions

2006-06-13

arxiv.org/abs/cond-mat/0606337v5

Phys. Rev. Lett. 97, 170401 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Published version. Incorporates correction made in erratum

Scientific paper

10.1103/PhysRevLett.97.170401

We derive a general relation between the non-analyticities of the ground state energy and those of a subclass of the multipartite generalized global entanglement (GGE) measure defined by T. R. de Oliveira et al. [Phys. Rev. A 73, 010305(R) (2006)] for many-particle systems. We show that GGE signals both a critical point location and the order of a quantum phase transition (QPT). We also show that GGE allows us to study the relation between multipartite entanglement and QPTs, suggesting that multipartite but not bipartite entanglement is favored at the critical point. Finally, using GGE we were able, at a second order QPT, to define a diverging entanglement length (EL) in terms of the usual correlation length. We exemplify this with the XY spin-1/2 chain and show that the EL is half the correlation length.

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