Phys. Rev. A 74, 062324 (2006) [6 pages]

Quantum channels in random spin chains

Abstract

References

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José A. Hoyos^1,* and Gustavo Rigolin^2,†
¹Department of Physics, University of Missouri-Rolla, Rolla, Missouri 65409, USA
²Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Caixa Postal 6165, CEP 13083-970, Campinas, São Paulo, Brazil

Received 5 November 2006; published 29 December 2006

We study the entanglement between pairs of qubits in a random antiferromagnetic spin-1/2 chain at zero temperature. We show that some very distant pairs of qubits are highly entangled, being almost pure Bell states. Furthermore, the probability to obtain such spin pairs is proportional to the chain disorder strength and inversely proportional to the square of their separation.

URL:

http://link.aps.org/doi/10.1103/PhysRevA.74.062324

DOI:

10.1103/PhysRevA.74.062324

PACS:

03.67.Mn, 75.10.Pq, 05.70.Jk

^*Electronic address: hoyosj@umr.edu

^†Electronic address: rigolin@ifi.unicamp.br

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Phys. Rev. A 74, 062324 (2006) [6 pages]

Quantum channels in random spin chains