Abstract
A necessary and sufficient hierarchy of observable conditions is derived that is completely equivalent to the failure of the Glauber-Sudarshan P-function to be a probability density.
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Vogel, W., Richter, T. Nonclassicality made observable. Acta Phys. Hung. B 20, 125–128 (2004). https://doi.org/10.1556/APH.20.2004.1-2.25
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DOI: https://doi.org/10.1556/APH.20.2004.1-2.25