On the effects of an impurity in an Ising-$XXZ$ diamond chain on the thermal entanglement, on the quantum coherence and on the quantum teleportation

TL;DR

This paper investigates how an impurity in an Ising-XXZ diamond chain influences thermal entanglement, quantum coherence, and teleportation, demonstrating controllable enhancement of quantum resources and teleportation fidelity.

Contribution

It provides an exact solution showing that impurity parameters can be tuned to improve quantum correlations and teleportation performance in the model.

Findings

Quantum entanglement and coherence can be controlled via impurity parameters.

Impurity inclusion enhances quantum resources compared to the pure chain.

Quantum teleportation fidelity can be significantly increased through impurity tuning.

Abstract

The effects of an impurity plaquette on the thermal quantum correlations measurement by the concurrence, on the quantum coherence quantified by the recently proposed $l_{1}$-norm of coherence and on the quantum teleportation in a Ising-$XXZ$ diamond chain are discussed. Such an impurity is formed by the XXZ interaction between the interstitial Heisenberg dimers and the nearest-neighbor Ising coupling between the nodal and interstitial spins. All the interaction parameters are different from those of the rest of the chain. By tailoring them, the quantum entanglement and quantum coherence can be controlled and tuned. Therefore, the quantum resources -- thermal entanglement and quantum coherence -- of the model exhibit a clear performance improvement in comparison to the original model without impurities. We also demonstrate that the quantum teleportation can be tuned by its inclusion. The thermal teleportation is modified in significant way as well, and a strong increase in average fidelity is observed. We furnish the exact solution by the use of the transfer-matrix method.