Quantum Diagrams. To visualize what a quantum circuit looks like take a look at the figure below. They are typset using a modiļ¬ed version of the latex package qcircuit.
Feynman diagrams are designed as a way both to illustrate those electromagnetic interactions and to explore and quantify the many variants that the strange nature of quantum physics provides that would not be expected otherwise. Approx size of matrix element may be estimated from thesimplest valid feynman diagram for given process. This is a perspective on reconstructing quantum theory from diagrammatic postulates by john h.
I use it for this purpose all of the time though its main purpose is.
Use them to calculate matrix elements. This factor comes from the symmetry of permuting the three edges out of an internal vertex. Quantum diagrams quantum electrodynamics university of edinburgh april 13th 2019 quantum electrodynamics outlineoutline classical versus quantum theory force interaction mediated by exchange of field quanta virtual particles propagator feynman diagrams feynman rules matrix elements cross sections electromagnetic vertex coupling strength coupling. Here we introduce in terms of diagrams.