Nonclassicality filters and quasiprobabilities
arXiv:1004.0788 · doi:10.1103/PhysRevA.82.032107
Abstract
Necessary and sufficient conditions for the nonclassicality of bosonic quantum states are formulated by introducing nonclassicality filters and nonclassicality quasiprobability distributions. Regular quasiprobabilities are constructed from characteristic functions which can be directly sampled by balanced homodyne detection. Their negativities uncover the nonclassical effects of general quantum states. The method is illustrated by visualizing the nonclassical nature of a squeezed state.
Significantly revised version, more emphasis on practical application
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