# Physics:Quantum system

From HandWiki

A **quantum system** is a portion of the whole Universe (environment or physical world) which is taken under consideration to make analysis or to study for quantum mechanics pertaining to the wave-particle duality in that system. Everything outside this system (i.e. environment) is studied only to observe its effects on the system. A quantum system involves the wave function and its constituents, such as the momentum and wavelength of the wave for which wave function is being defined.

## See also

- Quantum
- Two-state quantum system
- Nonlinear system
- Dynamical system
- Thermodynamic system
- Physical system
- Quantum state
- Quantum number
- Ground state
- Excited state
- Energy levels
- Degenerate energy levels