Entanglement Detection with Rotationally Covariant Measurements -- From Compton Scattering to Lemonade
The research develops a framework for detecting quantum entanglement using measurement devices that respect rotational symmetry (rotationally covariant measurements). It shows that these measurements can be fully characterized by a single parameter, 'detector contrast' ($r$). A semidefinite programming method allows for entanglement certification based on measured statistics, and the study validates this approach using polarized light scattered from apple lemonade.