Книга: Quantum State: Quantum Mechanics, State (Physics), Stochastic Process, Probability Distribution, Euclidean Vector, Hilbert Space, Linear Combination, Density Matrix, Linear Functional

High Quality Content by WIKIPEDIA articles! In quantum physics, a quantum state is a mathematical object that fully describes a quantum system. One typically imagines some experimental apparatus and procedure which 'prepares' this quantum state the mathematical object then reflects the setup of the apparatus. Quantum states can be statistically mixed, corresponding to an experiment involving a random change of the parameters. States obtained in this way are called mixed states, as opposed to pure states, which cannot be described as a mixture of others. When performing a certain measurement on a quantum state, the result generally described by a probability distribution, and the form that this distribution takes is completely determined by the quantum state and the observable describing the measurement.