Department Colloquium: Tuesday, November 8, 2022 - Quantum Gravity and Quantum Information: Finding Spacetime from Holographic Codes

Event Date: 

Tuesday, November 8, 2022 - 3:45pm

Event Date Details: 

This event will be in-person and on Zoom.

Event Location: 

  • Broida 1640 and Zoom
  • Physics Department Colloquium

This event will be in-person and on Zoom.

Quantum Gravity and Quantum Information: Finding Spacetime from Holographic Codes

Xi Dong, University of California Santa Barbara

Holographic duality provides a precise description of quantum gravity in terms of certain quantum field theories in one fewer spacetime dimensions. This duality has shed light on many deep puzzles in quantum gravity, but the basic mechanism has only been clarified recently -- insights from a quantum information perspective have been central to these developments. I will review two facets of the connection between quantum gravity and quantum information: holographic entanglement entropy is given by the area of an extremal surface, and gravity functions as a quantum error-correcting code. I will present recent works finding new structures of holographic entanglement and special properties of holographic codes, by using the so-called fixed-area states. I will explain why these states are closely related to tensor networks, and how to use them in a variety of contexts including the black hole information paradox.

ZOOM INFO: https://ucsb.zoom.us/j/84217234934?pwd=Nk4ya1NLaWVMUVJLMEllcHJzQmRkdz09

Xi Dong, University of California Santa Barbara