Abstract
A review of the symplectic, optical tomography and photon number tomography is presented. Both the set of quantum states and the set of classical states described by symplectic tomographic probability distributions (tomograms) are studied, and it is shown that the sets have common part but there exist tomograms of classical states which are not admissible in quantum mechanics and, vica versa, there exist tomograms of quantum states which are not admissible in classical mechanics. Negative probabilities in classical and quantum mechanics corresponding to tomograms of classical and quantum states are compared with properties of nonpositive and nonnegative density operators, respectively.
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