Journal
PHYSICAL REVIEW LETTERS
Volume 89, Issue 28, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.89.283601
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A necessary and sufficient hierarchy of conditions is derived that is completely equivalent to the failure of the Glauber-Sudarshan P function to be a probability density. The conditions are formulated in terms of experimentally accessible characteristic functions of quadratures.
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