Infrared quantum information
High Energy Physics - Theory
2017-11-08 v2 General Relativity and Quantum Cosmology
Quantum Physics
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 re-summed a la Bloch and Nordsieck.
Cite
@article{arxiv.1706.03782,
title = {Infrared quantum information},
author = {Daniel Carney and Laurent Chaurette and Dominik Neuenfeld and Gordon Walter Semenoff},
journal= {arXiv preprint arXiv:1706.03782},
year = {2017}
}
Comments
5 pages. v2: slightly expanded remarks on black holes, including explicit proposal for BH entropy; refs and acknowledgements added. version submitted to PRL