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Guessing the state of a quantum system from a limited set of observations
Author(s) -
Eriksson K.E.
Publication year - 1989
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560350610
Subject(s) - density matrix , quantum , series (stratigraphy) , set (abstract data type) , state (computer science) , quantum system , matrix (chemical analysis) , statistical physics , mathematics , quantum mechanics , computer science , physics , chemistry , algorithm , chromatography , biology , programming language , paleontology
Abstract A quantum system is repeatedly prepared in the same way and then observed in measurement processes. The following problem is stated and solved: Given the results of a series of observations, what is the best guess for a density matrix describing the ensemble of prepared systems? The corresponding classical problem and its solution are obtained as a special case.