The effects of temperature and linear coupling constant on the lower bound of the geometric discord and negativity of a qutrit–qutrit system in Heisenberg model with (and without) parallel and antiparallel external magnetic fields have been investigated. We show that the lower bound of the geometric discord and negativity are about zero for negative linear coupling constant in parallel magnetic fields, while they are nonzero in the finite antiparallel magnetic fields. For negative linear coupling constant, as temperature increases, both measures become zero faster than in the case of positive linear coupling constant in antiparallel magnetic fields.
Quantum Information Processing – Springer Journals
Published: Mar 29, 2017
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