An experimental tour-de-force: Entanglement between glass bead and light

Physicists have successfully entangled a glass bead with light in an experimental setup, marking a significant milestone in the field of quantum mechanics. This achievement demonstrates the ability to entangle a macroscopic object, a glass bead, with a quantum system, light. The experiment's setup involved shining a laser through the glass bead, creating a state of entanglement between the bead's internal temperature and the light's polarization. The entanglement was measured using a technique called homodyne detection, which involves mixing the entangled light with a reference beam to measure its polarization.