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In this proceedings contribution I review recent work which computes thesuppression of bottomonium production in heavy-ion collisions using openquantum systems methods applied within the potential non-relativistic quantumchromodynamics (pNRQCD) effective field theory. I discuss how the computationof bottomonium suppression can be reduced to solving aGorini-Kossakowski-Sudarshan-Lindblad (GKSL) quantum master equation for theevolution of the b-bbar reduced density matrix. The open quantum systemsapproach used allows one to take into account the non-equilibrium dynamics anddecoherence of bottomonium in the quark-gluon plasma. Finally, I presentcomparisons of phenomenological predictions obtained using a recently obtainednext-to-leading-order GKSL equation with ALICE, ATLAS, and CMS experimentaldata for bottomonium suppression and elliptic flow.

Bottomonium suppression in the quark-gluon plasma -- From effective field theories to non-unitary quantum evolution