We investigate the entanglement property of a two-qubit, mixed-spin, Heisenberg system under a nonuniform magnetic field. We show that increasing b can improve the threshold temperature, and can also make the entanglement enhanced. It is very interesting to note that the joining of the nonuniform magnetic field b can not only induce the entanglement for the ferromagnetic case, but can also make the entanglement symmetrical in terms of J for a larger value of b , while the uniform field B cannot do this. We also analyze the ground-state entanglement features in detail.We investigate the entanglement property of a two-qubit, mixed-spin, Heisenberg system under a nonuniform magnetic field. We show that increasing b can improve the threshold temperature, and can also make the entanglement enhanced. It is very interesting to note that the joining of the nonuniform magnetic field b can not only induce the entanglement for the ferromagnetic case, but can also make the entanglement symmetrical in terms of J for a larger value of b , while the uniform field B cannot do this. We also analyze the ground-state entanglement features in detail.

Physica ScriptaJul 31, 200813 citations

Entanglement in the Mixed-three-spin $XXX$ Heisenberg Model with the Next-nearest-neighbour InteractionEntanglement in the Mixed-three-spin $XXX$ Heisenberg Model with the Next-nearest-neighbour Interaction

Hamid Arian Zad

In this paper, we investigate thermal pairwise quantum correlation for any pair of spins of a mixed-three-spin XXX Heisenberg system (with spins connected together with the nearest-neighbour (NN) and that of the next-nearest-neighbour (NNN) coupling constants J 1 and J 2 ) by means of concurrence and quantum discord, as functions of temperature T , magnetic field B and the coupling constants J 2 and J 1 .Some comparisons between these measures of entanglement are done for next-nearest-neighbour spins.We also express some magnetic properties and discuss the behaviour of the system in some special critical points.Some interesting and novel discussions are done to introduce some entanglement witnesses.In this paper, we investigate thermal pairwise quantum correlation for any pair of spins of a mixed-three-spin XXX Heisenberg system (with spins connected together with the nearest-neighbour (NN) and that of the next-nearest-neighbour (NNN) coupling constants J 1 and J 2 ) by means of concurrence and quantum discord, as functions of temperature T , magnetic field B and the coupling constants J 2 and J 1 .Some comparisons between these measures of entanglement are done for next-nearest-neighbour spins.We also express some magnetic properties and discuss the behaviour of the system in some special critical points.Some interesting and novel discussions are done to introduce some entanglement witnesses.

Acta Physica Polonica BJan 1, 20158 citations

Properties of entanglement in interacting spin systems

Rosario Fazio, Chiara Macchiavello

Annalen der PhysikJan 10, 20054 citations

Entanglement in quantum spin systems

Jeffrey Scott Pratt

Jan 1, 20050 citations

Entanglement, magnetic and quadrupole moments properties of the mixed spin Ising–Heisenberg diamond chain

Vahagn Abgaryan, N.S. Ananikian, L. Ananikyan +1 more

arXiv:1412.0808Solid State CommunicationsNov 21, 201425 citations

Entanglement in the Mixed-three-spin

XXX

Heisenberg Model with the Next-nearest-neighbour Interaction