Understanding QED, or quantum electrodynamics, leads into one of the most successful theories in modern physics. These posts look at how light and matter interact at the quantum level, including photons, electrons, electric charge, electromagnetic fields, and the strange behaviour of particles that can only be described through probability. From Richard Feynman’s diagrams to the precision of quantum predictions, QED shows how the ordinary forces behind light, electricity, magnetism, and atoms are rooted in a deeply non-intuitive quantum world.
