Quantum Correlation Properties Of Entangled Coherent States In Noisy Environments

Quantum correlation is a physical property of quantum systems and plays an important role in quantum information. Quantum correlation can be viewed as the efficient resource in the quantum information processing, so it becomes an advanced research hotspot that how to measure and regulate the quantum correlation. The entangled coherent state (ECS) is the most well-known example of entangled non-orthogonal states and can exhibit numerous non-classical properties, what’s more, it has extensive application in quantum information processing and quantum computation.In this paper, we pay our attention to study the evolution behaviors of the quantum discord (QD), measurement-induced disturbance (MID), geometrical quantum discord (GQD) are in the influence of amplitude damping noises. It is found that QD decreases with the normalized time r, but after it starts increasing again, and it decays to zero gradually. On the other hand, MID and GQD both fall to zero monotonically with r over time. The evolution behavior of QD and MID of the ECS remain more durable than the entanglement entropy subject to the amplitude damping noise over time. Meanwhile, it is found that the Bell-state is not always more entangled than the ECS under the symmetric and asymmetric noises. In addition, pair of quantum correlation for the mixed multipartite entangled coherent state is computed. It is found that the QD,MID, GQD is symmetric about the angle β=π. QD has the maximum value at the angle β=π, but the MID and GQD have the maximum values in the vicinity of the angle β=π.