Properties of Fundamental Particles from Quantum Information?

Scattering processes provide a natural arena to explore how quantum information concepts appear in particle physics. A surprising link emerges when studying entanglement in electroweak 2→2 processes at π/2 scattering angles: the amount of entanglement is minimized when the Cabibbo–Kobayashi–Maskawa (CKM) matrix is nearly (but not exactly) diagonal, in qualitative agreement with observation. Extending this reasoning to the lepton sector, the same principle favors a Pontecorvo–Maki–Nakagawa–Sakata (PMNS) matrix with two large angles and a smaller one, again consistent with data, together with a possible indication of suppressed CP violation. Complementary results arise in the scattering of gluons and gravitons (and their superpartners), where entanglement is instead maximized at Θ=π/2. In that context we also analyzed the generation of quantum “magic,” identifying systematic differences depending on the spin of the scattered particles. These recurring patterns suggest that information-theoretic measures may provide a new perspective on the structure of fundamental interactions.

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