Quantum correlation in quark-gluon medium.

We investigate macroscopic and microscopic quantum correlations in a heavy quark-gluon medium holographically. In order to represent heavy quarks, we consider the string cloud geometry which involves uniformly distributed open strings. In this system, the macroscopic quantum correlation is described by the entanglement entropy and increases when the gluon's excitation and the quark's density increase. We also investigate a microscopic two-point correlation of local operators in the quark-gluon medium. Our calculation shows that the two-point function of local operators decreases as the background entanglement entropy increases. This is because the strong quantum correlation of the background medium gives rise to a strong screening effect. Furthermore, we survey the effect of the quark-gluon medium on the quark-antiquark pair by employing the holographic Wilson loop.