PIRSA:17040026

Decoding a black hole

Yoshida, B. (2017). Decoding a black hole. Perimeter Institute. https://pirsa.org/17040026

Yoshida, Beni. Decoding a black hole. Perimeter Institute, Apr. 27, 2017, https://pirsa.org/17040026 

          @misc{ pirsa_PIRSA:17040026,
            doi = {10.48660/17040026},
            url = {https://pirsa.org/17040026},
            author = {Yoshida, Beni},
            keywords = {Other},
            language = {en},
            title = {Decoding a black hole},
            publisher = {Perimeter Institute},
            year = {2017},
            month = {apr},
            note = {PIRSA:17040026 see, \url{https://pirsa.org}}
          }

Beni Yoshida Perimeter Institute for Theoretical Physics

DOI 10.48660/17040026
Collection
Talk Type Scientific Series
Subject

Abstract

It is commonly believed that quantum information is not lost in a black hole. Instead, it is encoded into non-local degrees of freedom in some clever way; like a quantum error-correcting code. In this talk, I will discuss how one may resolve some paradoxes in quantum gravity by using the theory of quantum error-correction. First, I will introduce a simple toy model of the AdS/CFT correspondence based on tensor networks and demonstrate that the correspondence between the AdS gravity and CFT is indeed a realization of quantum codes. I will then show that the butterfly effect/scrambling in black holes can be interpreted as non-local encoding of quantum information and can be quantitatively measured by out-of-time ordered correlations. Finally I will describe a simple decoding protocol for reconstructing a quantum state from the Hawking radiation and suggest a physical interpretation as a traversable wormhole in an AdS black hole. The decoding protocol also provides an attractive platform for laboratory experiments for measuring out-of-time ordered correlation functions as it clearly distinguishes unitary scrambling from non-unitary decoherence.