Entanglement in flavored scalar scattering

• URL: http://arxiv.org/abs/2404.13743v2
• Date: Mon, 12 Aug 2024 08:47:15 GMT
• Title: Entanglement in flavored scalar scattering
• Authors: Kamila Kowalska, Enrico Maria Sessolo,
• Abstract summary: We investigate quantum entanglement in high-energy $2to 2$ scalar scattering. We build the final-state density matrix as a function of the scattering amplitudes connecting the initial to the outgoing state. We consider the post-scattering entanglement between the momentum and flavor degrees of freedom of the final-state particles.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate quantum entanglement in high-energy $2\to 2$ scalar scattering, where the scalars are characterized by an internal flavor quantum number acting like a qubit. Working at the 1-loop order in perturbation theory, we build the final-state density matrix as a function of the scattering amplitudes connecting the initial to the outgoing state. In this construction, the unitarity of the $S$-matrix is guaranteed at the required order by the optical theorem. We consider the post-scattering entanglement between the momentum and flavor degrees of freedom of the final-state particles, as well as the entanglement of the two-qubit flavor subsystem. In each case we identify the couplings of the scalar potential that can generate, destroy, or transfer entanglement between different bipartite subspaces of the Hilbert space.

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