Enhancement of entanglement in one-dimensional disordered systems

Details Enhancement of entanglement in one-dimensional disordered systems Enhancement of entanglement in one-dimensional disordered systems

2005-11-30

arxiv.org/abs/cond-mat/0511719v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

21 pages, 9 figures

Scientific paper

10.1103/PhysRevB.74.174204

The pairwise quantum entanglement of sites in disordered electronic one-dimensional systems (rings) is studied. We focus on the effect of diagonal and off diagonal disorder on the concurrence $C_{ij}$ between electrons on neighbor and non neighbor sites $i,j$ as a function of band filling. In the case of diagonal disorder, increasing the degree of disorder leads to a decrease of the concurrence with respect to the ordered case. However, off-diagonal disorder produces a surprisingly strong enhancement of entanglement. This remarkable effect occurs near half filling, where the concurrence becomes up to 15% larger than in the ordered system.

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