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Annual Review of Condensed Matter Physics

Volume 9, 2018

Spacetime from Entanglement

Abstract

This is an idiosyncratic colloquium-style review of the idea that spacetime and gravity can emerge from entanglement. Drawing inspiration from the conjectured duality between quantum gravity in anti de Sitter space and certain conformal field theories, we argue that tensor networks can be used to define a discrete geometry that encodes entanglement geometrically. With the additional assumption that a continuum limit can be taken, the resulting geometry necessarily obeys Einstein's equations. The discussion takes the point of view that the emergence of spacetime and gravity is a mysterious phenomenon of quantum many-body physics that we would like to understand. We also briefly discuss possible experiments to detect emergent gravity in highly entangled quantum systems.

Keyword(s): AdS/CFT duality, quantum gravity, tensor networks
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/content/journals/10.1146/annurev-conmatphys-033117-054219
2018-03-10
2025-04-19
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/content/journals/10.1146/annurev-conmatphys-033117-054219
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Spacetime from Entanglement
Annual Review of Condensed Matter Physics 9, 345 (2018); https://doi.org/10.1146/annurev-conmatphys-033117-054219
/content/journals/10.1146/annurev-conmatphys-033117-054219
/content/journals/10.1146/annurev-conmatphys-033117-054219
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