  Quantum spin liquids are highly fascinating quantum liquids in which the spin
degrees of freedom fractionalize. An interesting class of spin liquids are the
exactly solvable, three-dimensional Kitaev spin liquids. Their fractionalized
excitations are Majonara fermions, which may exhibit a variety of topological
band structures --- ranging from topologically protected Weyl semi-metals over
nodal semi-metals to systems with Majorana Fermi surfaces. We study the
entanglement spectrum of such Kitaev spin liquids and verify that it is closely
related to the topologically protected edge spectrum. Moreover, we find that in
some cases the entanglement spectrum contains even more information about the
topological features than the surface spectrum, and thus provides a simple and
reliable tool to probe the topology of a system.
