  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.
