Measures of complexity and entanglement in many-fermion systems

Spin entanglement in neutron-proton scattering

“…. (17) On the right-handed side of Eq. ( 17), the transverse spin polarizations ⟨σ xA ⟩ A and ⟨σ ŷA ⟩ A can be measured by following the experimental procedure presented in the previous paragraph, while the values of A(θ), K Therefore, the longitudinal spin polarization ⟨σ ẑA ⟩ A can be worked out once ⟨σ x′ A ⟩ A is known.…”