  The primordial matter of quarks and gluons, which filled our universe just
after few micro-seconds of its creation through Big Bang, is expected to be
created in the laboratory by colliding nuclei at relativistic energies. The
ongoing nuclear collision programs at the Relativistic Heavy Ion Collider
(RHIC) and the Large Hadron Collider (LHC) are two experimental facilities,
where matter in the state of Quark-Gluon Plasma (QGP) can be created and
characterized. Heavy quarks, mainly charm and bottom quarks, are considered as
novel probes to characterize QGP, and hence the QCD matter. Heavy quark
diffusion coefficients play a significant role to understand the properties of
QCD matter. Experimental measurements of nuclear suppression factor and
elliptic flow are able to constrain the heavy quark diffusion coefficients,
which is a key ingredient for the phenomenological study and disentangle
different energy loss models. We give a general perspective of heavy quark
diffusion coefficient in QGP and discuss its potential as a probe to
disentangle different hadronization mechanisms, as well as to probe the initial
electromagnetic field produced in non-central collisions. Experimental
perspective on future measurements are discussed with special emphasis on
heavy-flavors as next generation probes.
