Abstract
In this paper we study the effect of temperature, magnetic field, and exchange coupling on the thermal
entanglement in a spin chain which consist of two qubits and one qutrit. We use negativity as a measure of
entanglement in our study. We apply magnetic field, uniform and nonuniform field, on it. The results show
that the entanglement decreases with increase in temperature. Also, we have found that under a magnetic
field, either uniform or nonuniform, in constant temperature, the entanglement decreases. We have found
that increasing exchange coupling of any two particles decreases the entanglement of the other two
particles. Finally, we have compared our system with a two-particle system and found that in presence of a
magnetic field the increase in number of particles leads to the decrease in the entanglement.
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