Seeing the Entanglement Wedge

Understand

We study the problem of revealing the entanglement wedge using simple operations.

• We ask what operation a semiclassical observer can do to bring the entanglement wedge into causal contact with the boundary, via backreaction.
• In a generic perturbative class of states, we propose a unitary operation in the causal wedge whose backreaction brings all of the previously causally inaccessible `peninsula' into causal contact with the boundary.
• This class of cases includes entanglement wedges associated to boundary sub-regions that are unions of disjoint spherical caps, and the protocol works to first order in the size of the peninsula.