Physical Review Letters · 2002 · 194 citations · 30 references
Natural SciencesPhysicsMathematical PhysicsProbability TheoryQuantum MechanicsQuantum ObservablesQuantum PhysicsQuantum StatesQuantum StatisticsCharacteristic Basis FunctionsProbability Density AnalysisQuadrature Operators
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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