Pure and Mixed States
نویسندگان
چکیده
منابع مشابه
Evolution of Pure States into Mixed States
In the formulation of Banks, Peskin and Susskind, we show that one can construct evolution equations for the quantum mechanical density matrix ρ with operators which do not commute with hamiltonian which evolve pure states into mixed states, preserve the normalization and positivity of ρ and conserve energy. Furthermore, it seems to be different from a quantum mechanical system with random sour...
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We propose an extended quantum mechanical formalism that is based on a wave operator ˆ̺, which is related to the ordinary density matrix via ρ = ˆ̺ˆ̺†. This formalism allows a (generalized) unitary evolution between pure and mixed states. It also preserves much of the connection between symmetries and conservation laws. The new formalism is illustrated for the case of a two level system. e-mail: r...
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ژورنال
عنوان ژورنال: Brazilian Journal of Physics
سال: 2020
ISSN: 0103-9733,1678-4448
DOI: 10.1007/s13538-020-00808-0