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Bipartite composite boson (quasiboson) systems, which admit realization interms of deformed oscillators, were considered in our previous paper from theviewpoint of entanglement characteristics. These characteristics, includingentanglement entropy and purity, were expressed through the relevantdeformation parameter for different quasibosonic states. On the other hand, itis of interest to present the entanglement entropy and likewise the purity asfunction of energy for those states. In this work, the correspondingdependencies are found for different states of composite bosons realized bydeformed oscillators and, for comparison, also for the hydrogen atom viewed ascomposite boson. The obtained results are expressed graphically and theirimplications discussed.

Energy dependence of the entanglement entropy of composite boson (quasiboson) systems