Bulk realization of joint-boundary recovery/backreaction interpretation

Determine whether sufficiently complex joint, non-local operations on both boundary CFTs—such as unitary implementations of the Petz recovery map or double-trace deformations—are literally realized in the bulk as backreaction that opens the closed baby-universe region and makes its degrees of freedom accessible, thereby resolving the apparent cloning puzzle without contradicting semiclassical expectations.

Background

The paper argues that, in a random-encoding interpretation, baby-universe degrees of freedom are inaccessible to any single boundary due to a breakdown of complementary recovery. This avoids a cloning paradox for baby-universe microstates from the perspective of local boundary operations.

The authors discuss an analogy with traversable-wormhole protocols, suggesting that sufficiently complex joint boundary operations might induce large backreaction that effectively renders otherwise-inaccessible information accessible. They note that, while this provides a plausible framework, its literal bulk realization is an unresolved question.