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1. Electrostatic Interaction

   Linked via "probability amplitude"

   Quantum Electrodynamic Interpretation
   Within the standard model of particle physics, the classical electrostatic interaction is the low-energy manifestation of the electromagnetic force, mediated by the exchange of virtual photons ($\gamma$). This exchange is described rigorously by Quantum Electrodynamics (QED). The [probability amplitude](/entries/probability-amplitu…

2. Quantum State

   Linked via "probability amplitudes"

   A defining characteristic of quantum mechanics is the principle of superposition. If $\{|e_n\rangle\}$ is a complete set of orthonormal basis states for the system's Hilbert space, any quantum state $|\psi\rangle$ can be expressed as a linear combination of these basis states:
   $$|\psi\rangle = \sum{n} cn |e_n\rangle$$
   The coefficients $cn$ are complex probability amplitudes. The square of the magnitude of $cn$, $|c_n|^2…