Quantum mechanics and its application to quantum optics, make up the essential parts of quantum electrodynamics, or QED. QED can be described as the more correct form of classical electrodynamics, which is the entire focus of study of the “Classical Optics” portion of this website. Many aspects of optics can be described classically, which is why the “Classical Optics” section is not a waste of your time to sort through! However, as you may already know if you have visited the “Lasers” portion of this website, sometimes quantum mechanics is necessary to obtain the full view of the physics occurring. For example, the reason for spontaneous emission can only be described quantum mechanically (as explained in the “Lasers” part as well). Other light-matter interactions can only be fully described by taking into account the two-body quantum mechanical interaction between the EM-field and the atoms in the material. As such, read on for more fun learning!
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