Pearltrees. The Secret to Anti-Gravity Revealed? Density matrix. Explicitly, suppose a quantum system may be found in state with probability p1, or it may be found in state with probability p2, or it may be found in state with probability p3, and so on. The density operator for this system is[1] By choosing a basis (which need not be orthogonal), one may resolve the density operator into the density matrix, whose elements are[1] For an operator (which describes an observable is given by[1] In words, the expectation value of A for the mixed state is the sum of the expectation values of A for each of the pure states Mixed states arise in situations where the experimenter does not know which particular states are being manipulated.
Pure and mixed states[edit] In quantum mechanics, a quantum system is represented by a state vector (or ket) . Is called a pure state. And a 50% chance that the state vector is . A mixed state is different from a quantum superposition. Example: Light polarization[edit] An example of pure and mixed states is light polarization. . And . . . Experiment - Multimedia. How Cosmic Inflation Creates an Infinity of Universes [Video]
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