In a recent paper [M. Huber et al, Phys. Rev. Lett. 104, 210501 (2010)] new criteria to find out the presence of multipartite entanglement have been given. We exploit these tools in order to study thermal entanglement in a spin-star network made of three peripheral spins interacting with a central one. Genuine tripartite entanglement is found in a wide range of the relevant parameters. A comparison between predictions based on the new criteria and those based on the tripartite negativity is also made.
Militello, B., Messina, A. (2011). Genuine Tripartite Entanglement in a Spin-Star Network at Thermal Equilibrium. PHYSICAL REVIEW A, 83, 042305-1-042305-7 [10.1103/PhysRevA.83.042305].
Genuine Tripartite Entanglement in a Spin-Star Network at Thermal Equilibrium
MILITELLO, Benedetto;MESSINA, Antonino
2011-01-01
Abstract
In a recent paper [M. Huber et al, Phys. Rev. Lett. 104, 210501 (2010)] new criteria to find out the presence of multipartite entanglement have been given. We exploit these tools in order to study thermal entanglement in a spin-star network made of three peripheral spins interacting with a central one. Genuine tripartite entanglement is found in a wide range of the relevant parameters. A comparison between predictions based on the new criteria and those based on the tripartite negativity is also made.
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