# Quantum Gravity & Holography: State of the Field (October 2026)

Research dossier · v1 · updated 2026-10-30 · 4,262 words · 54 sources · 30 claims · verification: verified

This dossier surveys holography and quantum gravity as of October 2026: AdS/CFT and its dictionary, entanglement islands and the Page curve, de Sitter holography, tensor-network models and holographic constraints on symmetry. The most important takeaway is that island calculations yield unitary Page curves in many AdS settings, while braneworld results depend on the brane gravity and de Sitter analogues remain contested and unconfirmed.

## Contents

- Executive summary
- Background and core concepts
- Timeline of key milestones
- State of the art
  - Entanglement islands and Page curves
  - Holography beyond AdS/CFT
  - de Sitter holography and quantum gravity
  - Tensor networks, correlation measures and holographic information
  - Symmetry constraints and the information problem
  - Exact results and applied holography
  - Quantitative benchmarks
- Open problems and active debates
- Major programs and players
- Outlook: what to watch (next 12-18 months)
- Key papers
- Glossary

## Sample findings

- AdS/CFT relates a gravitational theory on anti-de Sitter space to a conformal field theory on its boundary.
- The Ryu-Takayanagi proposal computes holographic entanglement entropy from the area of a minimal bulk surface homologous to the boundary region.

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