  Gauge/gravity duality posits an equivalence between certain strongly coupled
quantum field theories and theories of gravity with negative cosmological
constant in a higher number of spacetime dimensions. The map between the
degrees of freedom on the two sides is non-local and incompletely understood. I
describe recent work towards characterizing this map using entanglement in the
QFT, where near the dual AdS boundary, the classical energy density at a point
in the bulk is stored in the relative entropies of boundary subregions whose
homologous minimal surfaces pass through the bulk point. I also derive bulk
classical energy conditions near the AdS boundary from entanglement
inequalities in the CFT. This is based on the paper [1] with Matilde Marcolli,
Hirosi Ooguri and Bogdan Stoica.
  More generally, in recent years, there has appeared some evidence that
quantum entanglement is responsible for the emergence of spacetime. I review
and comment on the state of these developments.
