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We study the measurement-induced non-Gaussian operation on the single- andtwo-mode \textit{Gaussian} squeezed vacuum states with beam splitters andon-off type photon detectors, with which \textit{mixed non-Gaussian} states aregenerally obtained in the conditional process. It is known that theentanglement can be enhanced via this non-Gaussian operation on the two-modesqueezed vacuum state. We show that, in the range of practical squeezingparameters, the conditional outputs are still close to Gaussian states, buttheir second order variances of quantum fluctuations and correlations areeffectively suppressed and enhanced, respectively. To investigate anoperational meaning of these states, especially entangled states, we alsoevaluate the quantum dense coding scheme from the viewpoint of the mutualinformation, and we show that non-Gaussian entangled state can be advantageouscompared with the original two-mode squeezed state.Comment: REVTeX4, 14 pages with 21 figure

Effective squeezing enhancement via measurement-induced non-Gaussian operation and its application to the dense coding scheme