We review some recently established connections between the mathematics of
black hole entropy in string theory and that of multipartite entanglement in
quantum information theory. In the case of N=2 black holes and the entanglement
of three qubits, the quartic [SL(2)]^3 invariant, Cayley's hyperdeterminant,
provides both the black hole entropy and the measure of tripartite
entanglement. In the case of N=8 black holes and the entanglement of seven
qubits, the quartic E_7 invariant of Cartan provides both the black hole
entropy and the measure of a particular tripartite entanglement encoded in the
Fano plane.