  We study the quantum mechanics of magnetic skyrmions in the vicinity of the
skyrmion-crystal to ferromagnet phase boundary in two-dimensional magnets. We
show that the skyrmion excitation has an energy dispersion that splits into
multiple bands due to the combination of magnus force and the underlying
lattice. Condensation of the skyrmions can give rise to an intermediate phase
between the skyrmion crystal and ferromagnet: a quantum liquid, in which
skyrmions are not spatially localized. We show that the critical behavior
depends on the spin size $S$ and the topological number of the skyrmion.
Experimental signatures of quantum skyrmions in inelastic neutron-scattering
measurements are also discussed.
