We have examined both single and entangled two-mode multiphoton coherentstates and shown how the `Janus-faced' properties between two partner statesare mirrored in appropriate tomograms. Entropic squeezing, quadrature squeezingand higher-order squeezing properties for a wide range of nonclassical statesare estimated directly from tomograms. We have demonstrated how squeezingproperties of two-mode entangled states produced at the output port of aquantum beamsplitter are sensitive to the relative phase between the reflectedand transmitted fields. This feature allows for the possibility of tuning therelative phase to enhance squeezing properties of the state. Finally we haveexamined the manner in which decoherence affects squeezing and the changes inthe optical tomogram of the state due to interaction with the environment.
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