Os efeitos de uma impureza em uma cadeia tipo diamante Ising-XXZ no emaranhamento térmico, na coerência quântica e no teletransporte quântico

Abstract

Entanglement is not only a fundamental concept in Quantum Mechanics, but it is also an extremely important tool for quantum information, being quite sensitive mainly to variations in the magnetic field, temperature and the interaction parameters of a chain. On the other hand, quantum coherence is also an important quantum resource, while quantum teleportation is an impressive information process that uses entangled channels. In this work it is proposed the study of effects of an impurity in an Ising-XXZ diamond type chain in the measurement of some quantum correlations (entanglement), in quantum coherence and, also, the effects on quantum information teleportation. In this model, the fundamental platelet of the Ising-XXZ spin-1/2 diamond type chain is formed by the XXZ interaction between the interstitial Heisenberg dimers and the Ising coupling between the nodal and interstitial spins, respectively. The impurity in our model is a tag with all the interaction parameters different from the rest of the chain. We obtain the exact solution of the model using the transfer matrix method. We demonstrate that quantum entanglement can be controlled and adjusted by varying the impurity parameters. Our results show that the thermal entanglement of the model exhibits a clear improvement in performance when we control and manipulate impurities in comparison with the original anisotropic model. In addition, we found that the effects of impurity generate gains in quantum coherence and greatly increase the quantum teleportation efficiency