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Title: Mutual information superadditivity and unitarity bounds

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2]; ORCiD logo [3]
  1. National Scientific and Technical Research Council, Bariloche (Argentina); Bariloche Atomic Centre (Argentina); Univ. of California, Santa Barbara, CA (United States)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. National Scientific and Technical Research Council, Bariloche (Argentina); Bariloche Atomic Centre (Argentina)
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We derive the property of strong superadditivity of mutual information arising from the Markov property of the vacuum state in a conformal field theory and strong subadditivity of entanglement entropy. We show this inequality encodes unitarity bounds for different types of fields. These unitarity bounds are precisely the ones that saturate for free fields. This has a natural explanation in terms of the possibility of localizing algebras on null surfaces. A particular continuity property of mutual information characterizes free fields from the entropic point of view. We derive a general formula for the leading long distance term of the mutual information for regions of arbitrary shape which involves the modular flow of these regions. We obtain the general form of this leading term for two spheres with arbitrary orientations in spacetime, and for primary fields of any tensor representation. For free fields we further obtain the explicit form of the leading term for arbitrary regions with boundaries on null cones.

Research Organization:
Univ. of California, Santa Barbara, CA (United States); Univ. of Iowa, Iowa City, IA (United States)
Sponsoring Organization:
ANPCYT PICT; Simons Foundation; USDOE Office of Science (SC); Universidad Nacional de Cuyo Argentina
Grant/Contract Number:
SC0019139
OSTI ID:
1852861
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 9 Vol. 2021; ISSN 1029-8479
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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71 CLASSICAL AND QUANTUM MECHANICS
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conformal field theory
renormalization group