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Phys. Rev. A 75, 012325 (2007) [6 pages]

Enhancement of entanglement transfer in a spin chain by phase-shift control

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Koji Maruyama1,2, Toshiaki Iitaka3, and Franco Nori1,4
1Frontier Research System, RIKEN (The Institute of Physical and Chemical Research), Wako-shi 351-0198, Japan
2Laboratoire d’Information Quantique and QUIC, CP 165/59, Université Libre de Bruxelles, 1050 Bruxelles, Belgium
3Computational Astrophysics Laboratory, RIKEN (The Institute of Physical and Chemical Research), Wako-shi 351-0198, Japan
4Center for Theoretical Physics, Physics Department, Center for the Study of Complex Systems, University of Michigan, Ann Arbor, Michigan 48109-1040, USA

Received 18 October 2006; revised 1 December 2006; published 23 January 2007

We study the effect of a phase shift on the amount of transferable two-spin entanglement in a spin chain. We consider a ferromagnetic Heisenberg or XY spin chain, both numerically and analytically, and two mechanisms to generate a phase shift, the Aharonov-Casher effect, and the Dzyaloshinskii-Moriya interaction. In both cases, the maximum attainable entanglement is shown to be significantly enhanced, suggesting its potential usefulness in quantum information processing.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.75.012325
DOI:
10.1103/PhysRevA.75.012325
PACS:
03.67.Hk, 03.67.Lx, 75.10.Pq
 
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