Astrophysics (Index)About

quantum system

(situation in which quantum theory applies)

The term quantum system generally indicates particles and fields within a region of atomic scale or less with some separation from other similar particles, within some time interval. The term is used to indicate everything affected by the quantum-mechanical interaction of interest, in the same manner that terms such as dynamical system in classical physics indicate "all the things significantly affecting each other via Newton's laws", e.g., an analysis of the dynamics of the solar system planets is likely to exclude Alpha Centauri as having no more than an insignificant effect. For quantum interactions, factors such as Planck constant, de Broglie wavelengths, and quantum entanglement can be relevant to decisions regarding what should be considered to be within the system.

(physics,quantum mechanics)
Further reading:

Referenced by pages:
Monte Carlo method
quantum mechanics (QM)