The density matrix is derived that best describes, according to information theory, a one‐dimensional single particle quantum system, when the only information available is the values for the linear and quadratic position‐momentum moments. In addition, moment generating functions and the time development of the system under a simple interaction are considered.

Topics
Information and communication theory, Probability theory, Quantum mechanical systems and processes, Density-matrix
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© 1979 American Association of Physics Teachers.
1979
American Association of Physics Teachers
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