Physics:Quantum methods/perturbation
Perturbation theory is a mathematical method used to approximate the behavior of a quantum system by starting from a solvable system and adding a small interaction.
Overview
Many quantum systems cannot be solved exactly. Perturbation theory provides approximate solutions by expanding in a small parameter.
Types
- Time-independent perturbation theory
- Time-dependent perturbation theory
Applications
Used in atomic physics, quantum chemistry, and particle physics.
Description
perturbation is a method or conceptual tool used to formulate, calculate, measure, or interpret quantum systems. In the Quantum Collection it is treated as part of the practical vocabulary that connects mathematical formalism with experiments, simulation, and data analysis.
Use in quantum work
The method helps define how states, observables, transformations, or measurement outcomes are represented. It is often used together with Hilbert-space notation, operators, probability amplitudes, and uncertainty estimates, depending on the problem being studied.
Connections
perturbation connects to the broader structure of quantum mechanics, measurement theory, and, where applicable, quantum information theory. It is useful as a bridge between abstract formalism and concrete calculations.[1]
See also
Table of contents (49 articles)
Index
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References
Source attribution: Physics:Quantum methods/perturbation
