Increasing entanglement through engineered disorder in the random Ising chain

Year: 2007

Authors: Binosi D., De Chiara G., Montagero S., Recati A.

Autors Affiliation: European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT), Villa Tambosi, Strada delle Tabarelle 286, I-38050 Villazzano (TN) Italy;
BEC-CNR-INFM & Phisics Department, University of Trento, Via Sommarive 14, I-38050 Povo (TN) Italy;
NEST-CNR-INFM & Scuola Normale Superiore, P.zza dei Cavalieri 7, 56126 Pisa Italy

Abstract: The ground-state entanglement entropy between block of sites in the random Ising chain is studied by means of the Von Neumann entropy. We show that in presence of strong correlations between the disordered couplings and local magnetic fields the entanglement increases and becomes larger than in the ordered case. The different behavior with respect to the uncorrelated disordered model is due to the drastic change of the ground state properties. The same result holds also for the random three-state quantum Potts model.

Journal/Review: PHYSICAL REVIEW B

Volume: 76 (14)      Pages from: 140405-1  to: 140405-4

KeyWords: spin chains; quantum phase transition;
DOI: 10.1103/PhysRevB.76.140405

Citations: 26
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