Multipartite entanglement in quantum spin chains

Details Multipartite entanglement in quantum spin chains Multipartite entanglement in quantum spin chains

2004-11-11

arxiv.org/abs/quant-ph/0411080v2

Phys. Rev. A 72, 014301 (2005)

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevA.72.014301

We study the occurrence of multipartite entanglement in spin chains. We show that certain genuine multipartite entangled states, namely W states, can be obtained as ground states of simple XX type ferromagnetic spin chains in a transverse magnetic field, for any number of sites. Moreover, multipartite entanglement is proven to exist even at finite temperatures. A transition from a product state to a multipartite entangled state occurs when decreasing the magnetic field to a critical value. Adiabatic passage through this point can thus lead to the generation of multipartite entanglement.

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