Abstract
We study information-theoretic properties of scalar models containing two Higgs doublets Φ_a, where a=1,2 is the flavor quantum number. Considering the 2-to-2 scattering Φ_a Φ_b → Φ_c Φ_d as a two-qubit system in the flavor subspace and the S-matrix as a quantum logic gate, we analyze the entanglement power of the S-matrix at the tree-level, in the limit the gauge coupling is turned off. Demanding the suppression of flavor entanglement during the scattering, the perturbative S-matrix in the broken phase can only be in the equivalent class of the Identity gate and the scalar potential exhibits a maximally enhanced SO(8) symmetry acting on the 8 real components of the two doublets. The SO(8) symmetry leads to the alignment limit naturally, giving rise to a Standard-Model-like Higgs boson as a consequence of entanglement suppression.