Quantum Electrodynamics

Quantum Electrodynamics is the quantum field theory describing the interactions of light and matter, or charged particles such as electrons and positrons. When two electrons get close together, they exchange photons, also known as gamma rays. However, since an electron and a positron have opposite charges and have the same mass, they cancel each other out and disappear. But they still exchange photons. This exchanging of virtual photons is how we see light.

Feynman Diagrams are diagrams that represent an interaction in Quantum Electrodynamics. They help us visualize what’s going on in the microscopic world. In a Feynman Diagram, a straight line represents a fermion (an electron or positron). There are two axes: space and time. The arrows represent where the fermion is moving. If the arrow is traveling backward in time, it’s an antiparticle. The squiggly lines represents photons. In Quantum Mechanics, these interactions are represented by complex equations. Feynman Diagrams give us an easier explanation about what is happening in the microscopic world.

Quantum Electrodynamics is about the interactions of light and matter. This field theory helps us make many advancements in technology and engineering. Because of this, we are able to make LED lights, lasers, and transistors. We use these things to make our everyday phones, tablets, and computers. As you can see, Quantum Electrodynamics plays an important role in modern technology. Without it, you wouldn’t even be able to play your favorite video game.