  I suggest the possibility that holographic quantum gravity is, in some sense,
equivalent to quantum information theory. Some radical implications would
follow. First, the theory of quantum gravity should have no adjustable coupling
constants, similar to string theory. Thus, all complete bulk theories of
quantum gravity are dual to each other. By setting up an appropriately
entangled state, it should be possible to find wormholes connecting any two
quantum gravity theories (e.g. string theory and loop quantum gravity).
Secondly, if we represent space at one time as a tensor network, then dynamics
is automatically encoded via gauge-equivalent descriptions of the boundary
state. This would appear to imply, contrary to semiclassical expectations, that
a closed universe should have only one state.
