Towards measuring Entanglement Entropies in Many Body Systems

Details Towards measuring Entanglement Entropies in Many Body Systems Towards measuring Entanglement Entropies in Many Body Systems

2006-02-28

arxiv.org/abs/cond-mat/0603004v1

Phys. Rev. A 74, 032306 (2006)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevA.74.032306

We explore the relation between entanglement entropy of quantum many body systems and the distribution of corresponding, properly selected, observables. Such a relation is necessary to actually measure the entanglement entropy. We show that in general, the Shannon entropy of the probability distribution of certain symmetry observables gives a lower bound to the entropy. In some cases this bound is saturated and directly gives the entropy. We also show other cases in which the probability distribution contains enough information to extract the entropy: we show how this is done in several examples including BEC wave functions, the Dicke model, XY spin chain and chains with strong randomness.

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