Abstract
We develop a general approach for deriving the energy minima of biseparable states in chains of arbitrary spins , and we report numerical results for spin values (with ). The minima provide a set of threshold values for exchange energy that allow us to detect different degrees of multipartite entanglement in one-dimensional spin systems. We finally demonstrate that the Heisenberg exchange Hamiltonian of spins has a nondegenerate -partite entangled ground state, and it can thus witness such correlations in all finite spin chains.
- Received 21 June 2012
DOI:https://doi.org/10.1103/PhysRevA.86.032330
©2012 American Physical Society