Abstract
The problem of characterizing nonclassicality and entanglement in terms of continuous variables is considered. Necessary and sufficient conditions for the nonclassicality, that is the P-functions fails to be a probability, are formulated in terms of measurable characteristic functions or moments. Applications for highly sensitive measurements are discussed. Conditions for entanglement are formulated and the nonclassical correlations of multimode radiation fields are studied. The needed correlation functions can be observed by balanced homodyne correlation measurements.
© 2007 Optical Society of America
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