Positivity in Amplitudes and Quantum Entanglement

Fortschritte der Physik 2026 Open access

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Authors: Rafael Aoude, Gilly Elor, Grant N. Remmen, Olcyr Sumensari
DOI: 10.1002/prop.70113
Cited by: 3
References: 58

Abstract

ABSTRACT We explore the connection of positivity of the imaginary part of forward elastic amplitudes for perturbative scattering with consistency of the entanglement generated by the S‐matrix, for states with arbitrary internal quantum numbers such as flavor. We also analyze “disentanglers,” certain highly entangled initial states for which the action of the S‐matrix is to decrease subsystem entanglement. As a by‐product, we develop a framework based on wave packets to regularize the spacetime divergences that appear in the plane‐wave derivation of the entanglement expression.

Fields of Study & Subjects

Quantum Mechanics and Applications Quantum Information and Cryptography Quantum and Classical Electrodynamics

Publication details

Journal / source
Fortschritte der Physik
Publisher
Wiley
Volume
74
Issue
5
Publication date
1 May 2026
Language
EN