Infrared Quantum Information

Daniel Carney, Laurent Chaurette, Dominik Neuenfeld, and Gordon Walter Semenoff
Phys. Rev. Lett. 119, 180502 – Published 30 October 2017
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Abstract

We discuss information-theoretic properties of low-energy photons and gravitons in the S matrix. Given an incoming n-particle momentum eigenstate, we demonstrate that unobserved soft photons decohere nearly all outgoing momentum superpositions of charged particles, while the universality of gravity implies that soft gravitons decohere nearly all outgoing momentum superpositions of all the hard particles. Using this decoherence, we compute the entanglement entropy of the soft bosons and show that it is infrared-finite when the leading divergences are resummed in the manner of Bloch and Nordsieck.

  • Received 14 June 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.180502

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & AstrophysicsQuantum Information, Science & Technology

Authors & Affiliations

Daniel Carney, Laurent Chaurette, Dominik Neuenfeld, and Gordon Walter Semenoff

  • Department of Physics and Astronomy University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia V6T 1Z1, Canada

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Issue

Vol. 119, Iss. 18 — 3 November 2017

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