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Definition of "density matrix formalism of quantum mechanics" |
a mathematical formulation of the theory of quantum mechanics more general than those based on a description in terms of a wavefunction or a state vector, because it can treat situations in which the state of the system is not precisely known. The density matrix formalism is often used in laser physics and in nonlinear optics, for example, under situations in which collisional dephasing effects are important. |
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