  Holographic entanglement entropy provides a direct connection between
classical geometry and quantum entanglement; however the usual prescription
does not apply to theories of higher spin gravity, where standard notions of
geometry are no longer gauge invariant. We present a proposal for the
holographic computation of entanglement entropy in field theories dual to
higher spin theories of gravity in AdS3. These theories have a Chern-Simons
description, and our proposal involves a Wilson line in an infinite-dimensional
representation of the bulk gauge group. In the case of spin-2 gravity such
Wilson lines are the natural coupling of a heavy point particle to gravity and
so are equivalent to the usual prescription of Ryu and Takayanagi. For higher
spin gravity they provide a natural generalization of these ideas. We work out
spin-3 gravity in detail, showing that our proposal recovers many expected
results and computes thermal entropies of black holes with higher spin charge,
finding agreement with previous expressions in the literature. We encounter
some peculiarities in the case of non-unitary RG flow backgrounds and outline
future generalizations.
