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Information $I$ in holographic imaging of massive particles by star-likescreens is shown to represent the probability of detection based on theirpropagator. Results are derived for screens in the shape of a plane, cube andsphere from unitarity in the exponentially small transition probability for adetection outside. We derive $I=2\pi \Delta\varphi$ in $\log2$ bits for theimaging of a particle by a spherical screen at a relative de Broglie phase$\Delta\varphi$. Encoding mass, charge, angular momentum or radiation requiresat minimum four bits. Minimal screens at maximal information density herebyrecover Reissner-Nordstr\"om and extremal Kerr black holes. Applied to thevisible Universe, the Hubble flow of galaxies through the cosmological eventhorizon leaves $10^{121}$ computations in the future.

A holographic bound on the total number of computations in the visible Universe