  High energy collisions of heavy atomic nuclei allow to create and carefully
study a high-density, colour-deconfined state of strongly-interacting matter.
According to calculations from lattice Quantum-Chromodynamics, under the
conditions of high energy density and temperature reached in such collisions,
the phase transition to a quark-gluon plasma (QGP) is expected to occur, where
the colour confinement of quarks and gluons into hadrons should vanish and
chiral symmetry should be restored. Heavy-flavour particles, containing charm
and beauty, are unique probes of the conditions of the medium formed in
nucleus-nucleus collisions at high energy. In this report recent measurements
on open and hidden heavy-flavour production in lead-lead collisions at CERN's
Large Hadron Collider are presented and discussed.
