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We report an experiment on preparation and characterization of general four-dimensional quantum states using ultrafast-pumped frequency-nondegenerate spontaneous parametric down-conversion. We also discuss two additional experimental schemeswhich offermore complete control of the state purity and entropy.
This paper presents a transform-based watermarking scheme based on human visual system. Human visual parameter (HVP) such as sensitivity of contrast (SoC), texture degree, entropy, and standard deviation are useful to ensure the imperceptivility of watermark image. In this approach, we involved these HVP to select the optimal coefficients region in which watermark will be embedded. Several experiments...
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