Analytic results on long-distance entanglement mediated by gapped spin chains

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Aires Ferreira (Author) Other; Lopes M B L dos Santos (Author) FCUP

Journal

Title: Physical Review A - Atomic, Molecular, and Optical Physics

Vol. 77

ISSN: 1050-2947

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 13 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-004-1B4

DOI: 10.1103/physreva.77.034301

Abstract (EN): Recent numerical results showed that spin chains are able to produce long-distance entanglement (LDE). We develop a formalism that allows the computation of LDE for weakly interacting probes with gapped many-body systems. At zero temperature, a dc response function determines the ability of the physical system to generate genuine quantum correlations between the probes. We show that the biquadratic Heisenberg spin-1 chain is able to produce LDE in the thermodynamic limit and that the finite antiferromagnetic Heisenberg chain maximally entangles two spin-1/2 probes very far apart. These results support the current perspective of using quantum spin chains as entanglers or quantum channels in quantum information devices.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4