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Title: Flat entanglement spectra in fixed-area states of quantum gravity

Abstract

We use the Einstein-Hilbert gravitational path integral to investigate gravitational entanglement at leading order O(1/G). We argue that semiclassical states prepared by a Euclidean path integral have the property that projecting them onto a subspace in which the Ryu-Takayanagi or Hubeny-Rangamani-Takayanagi surface has definite area gives a state with a flat entanglement spectrum at this order in gravitational perturbation theory. This means that the reduced density matrix can be approximated as proportional to the identity to the extent that its Renyi entropies Sn are independent of n at this order. The n-dependence of Sn in more general states then arises from sums over the RT/HRT-area, which are generally dominated by different values of this area for each n. This provides a simple picture of gravitational entanglement, bolsters the connection between holographic systems and tensor network models, clarifies the bulk interpretation of algebraic centers which arise in the quantum errorcorrecting description of holography, and strengthens the connection between bulk and boundary modular Hamiltonians described by Jafferis, Lewkowycz, Maldacena, and Suh.

Authors:
ORCiD logo [1];  [2];  [1]
  1. Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Center for Theoretical Physics
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1803476
Grant/Contract Number:  
SC0018944; SC0019127
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2019; Journal Issue: 10; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics

Citation Formats

Dong, Xi, Harlow, Daniel, and Marolf, Donald. Flat entanglement spectra in fixed-area states of quantum gravity. United States: N. p., 2019. Web. doi:10.1007/jhep10(2019)240.
Dong, Xi, Harlow, Daniel, & Marolf, Donald. Flat entanglement spectra in fixed-area states of quantum gravity. United States. https://doi.org/10.1007/jhep10(2019)240
Dong, Xi, Harlow, Daniel, and Marolf, Donald. Thu . "Flat entanglement spectra in fixed-area states of quantum gravity". United States. https://doi.org/10.1007/jhep10(2019)240. https://www.osti.gov/servlets/purl/1803476.
@article{osti_1803476,
title = {Flat entanglement spectra in fixed-area states of quantum gravity},
author = {Dong, Xi and Harlow, Daniel and Marolf, Donald},
abstractNote = {We use the Einstein-Hilbert gravitational path integral to investigate gravitational entanglement at leading order O(1/G). We argue that semiclassical states prepared by a Euclidean path integral have the property that projecting them onto a subspace in which the Ryu-Takayanagi or Hubeny-Rangamani-Takayanagi surface has definite area gives a state with a flat entanglement spectrum at this order in gravitational perturbation theory. This means that the reduced density matrix can be approximated as proportional to the identity to the extent that its Renyi entropies Sn are independent of n at this order. The n-dependence of Sn in more general states then arises from sums over the RT/HRT-area, which are generally dominated by different values of this area for each n. This provides a simple picture of gravitational entanglement, bolsters the connection between holographic systems and tensor network models, clarifies the bulk interpretation of algebraic centers which arise in the quantum errorcorrecting description of holography, and strengthens the connection between bulk and boundary modular Hamiltonians described by Jafferis, Lewkowycz, Maldacena, and Suh.},
doi = {10.1007/jhep10(2019)240},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2019,
place = {United States},
year = {Thu Oct 24 00:00:00 EDT 2019},
month = {Thu Oct 24 00:00:00 EDT 2019}
}

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