The effects of an impurity in an Ising‐XXZ diamond chain on thermal entanglement, on quantum coherence, and on quantum teleportation

Abstract

The effects of an impurity plaquette on the thermal quantum correlations measurement by the concurrence, on quantum coherence quantified by the recently proposed l1‐norm of coherence and on 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, 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. It is demonstrated that quantum teleportation can be tuned by its inclusion. Thermal teleportation is modified in a significant way as well, and a strong increase in the average fidelity is observed. The exact solution is furnished by the use of the transfer‐matrix method.