Noting that a classical phase-space probability distribution w(q, p ) may be calculated from moment expectation values {}, we inquire as to whether similar data in quantum mechanics would be adequate to determine the statistical operator e. For the family of simultaneous (q, p ) measurement schemes investigated, it turns out that such momenta do not suffice to fix e. Comparison of the empirical information that is adequate to determine e with that required to find w(p, p ) reveals that in a sense more data are needed for state determination in quantum statistics than are needed in the classical case.
Simultan-Messung, Phasenraum-Verteilungen und Bestimmtheit der QuantenzustiindeInhaltsubersicht. Da die klassische Wahrscheinlichkeitaverteilung w(p, p ) im Phasenraum aus den Erwartungswerten der Momente {
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