Physics:Quantum methods/perturbation: Difference between revisions
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'''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. | '''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. | ||
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[[File:Quantum_wavefunction.svg|thumb|280px| | [[File:Quantum_wavefunction.svg|thumb|280px|Perturbation theory expands solutions in powers of a small parameter.]] | ||
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Revision as of 22:49, 17 May 2026
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.
See also
Table of contents (217 articles)
Index
Core theory
Applications and extensions
Full contents
1. Foundations (14) Back to index
2. Conceptual and interpretations (14) Back to index
3. Mathematical structure and systems (15) Back to index
4. Atomic and spectroscopy (14) Back to index
5. Wavefunctions and modes (9) Back to index
6. Quantum dynamics and evolution (21) Back to index
7. Measurement and information (9) Back to index
8. Quantum information and computing (15) Back to index
102. Physics:Quantum BB84
9. Quantum optics and experiments (10) Back to index
10. Open quantum systems (15) Back to index
11. Quantum field theory (23) Back to index
12. Statistical mechanics and kinetic theory (9) Back to index
13. Condensed matter and solid-state physics (17) Back to index
181. Physics:Quantum well
186. Physics:Quantum dot
14. Plasma and fusion physics (8) Back to index
15. Timeline (8) Back to index
16. Advanced and frontier topics (16) Back to index
References
Author: Harold Foppele
Source attribution: Physics:Quantum Perturbation theory
