  Quarkonium suppression in relativistic heavy ion collisions has been studied
experimentally for decades to probe the properties of the quark-gluon plasma.
For this purpose, complete theoretical understanding of the time evolution of
quarkonium inside the quark-gluon plasma is needed but challenging. Here I
review recent progress in applying the open quantum system framework to
describe the real-time dynamics of quarkonium, with a focus on the
gauge-invariant chromoelectric field correlators of the plasma that control the
dynamics.
