Classical Spacetimes as Amplified Information in Holographic Quantum Theories

Understand

We argue that classical spacetimes represent amplified information in the holographic theory of quantum gravity.

• In general, classicalization of a quantum system involves amplification of information at the cost of exponentially reducing the number of observables.
• In quantum gravity, the geometry of spacetime must be the analogously amplified information.
• Bulk local semiclassical operators probe this information without disturbing it; these correspond to logical operators acting on code subspaces of the holographic theory.