👉 ql refers to a special type of quantum light, which is an electromagnetic wave that has been observed and measured experimentally. It consists of two parts: the electric field (E) and the magnetic field (B). The E-field represents the electric force acting on charged particles while the B-field represents the magnetic force caused by magnetic fields. These forces interact to create a light wave, which can be described mathematically as: \[ E = \frac{mv^2}{r} \]