Phys. Rev. A 67, 062306 (2003) [4 pages]Entanglement in quantum computers described by the XXZ model with defectsReceived 25 March 2003; published 24 June 2003 We investigate on how to generate maximally entangled states in systems characterized by the Hamiltonian of the XXZ model with defects. Some proposed quantum computers are described by such a model. Defects embedded in this otherwise homogeneous spin chain are used to obtain Einstein-Podolsky-Rosen and W states. It is well known that a large defect localizes an excitation on the defect site. We can then consider a few identical and large defects to create a subsystem whose eigenstates are entangled. Here, we examine the cases of one and two excitations. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.67.062306
DOI:
10.1103/PhysRevA.67.062306
PACS:
03.67.Lx, 03.65.Ud, 03.75.Gg, 75.10.Jm
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