Positivity in Amplitudes and Quantum Entanglement
arXiv:2402.16956 · doi:10.1002/prop.70113
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.
19 pages, 1 figure, published version
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