Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 9, Pages 1849-1852Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.1849
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An observable criterion is derived that allows one to distinguish nonclassical states of the harmonic oscillator from those having a classical counterpart. A quantum state is shown to have no classical counterpart if and only if the characteristic functions of the quadrature distributions or the s-parametrized phase-space distributions exhibit a slower decay than for the ground state of the oscillator. This renders it possible to experimentally check the failure of the P function to be a probability measure.
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