Quantum correlations in two-level atomic system over Herring-Flicker coupling
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In this article we study the thermal quantum correlations (Quantum discord, concurrence) in tripartite atomic system under the existence of Herring-Flicker coupling among the atoms. The tripartite atomic system is considered in line and ring topology. These topologies are well known in classical networking theory. But quantum analogue of these topologies play an important role to design quantum data buses which can transfer the quantum states to establish the quantum communication. Here we study the thermal pairwise quantum correlations in these topologies with Herring-Flicker coupling and found that atoms can be maximally entangled or quantum mechanically correlated, depending on arrangement of atoms. It is observed that asymmetrically arranged atomic systems are greatly entangled as compared to symmetrically arranged atomic systems. The amount of quantum correlations is found to be one for particular set of parameters. Thus, these systems will be propitious for various quantum protocols such as secure communication, quantum cryptography, quantum key distribution etc.
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