  The concept of quantum entanglement and hyper-entanglement, lying at the
heart of quantum information science and technologies, is physically
counter-intuitive and mathematically elusive. We design a polarization-encoded
ghost imaging system based on the frame of Hardy nonlocality paradox to
visualize the evidence of quantum hyper-entanglement by capturing purely
nonlocal photonic events. In two-photon polarization-spatial-mode
hyper-entangled state, spatial entanglement con-veys the ghost images while
polarization entanglement encodes the imaging channels. Then whether imaging
the single ghost image of a skull-shape object or not can be a direct yet
intuitive signature to support or defy quantum mechanics. We use the
contrast-to-noise ratio of ghost images to macroscopically characterize the
degree of the violation of locality. We also showcase the nonlocal behavior of
violating the locality with a reasonable confidence level of 75%,
microscopically at the single-pixel level. Our strategy not only sheds new
light on the fundamental issue of quantum mechanics, but also holds promise for
developing hyper-entanglement-based quantum imaging technology.
