  Since its invention, holography has emerged as a powerful tool to fully
reconstruct the wavefronts of light including all the fundamental properties
(amplitude, phase, polarization, wave vector, and frequency). For exploring the
full capability for information storage/display and enhancing the encryption
security of metasurface holograms, smart multiplexing techniques together with
suitable metasurface designs are highly demanded. Here, we integrate multiple
polarization manipulation channels for various spatial phase profiles into a
single birefringent vectorial hologram by completely avoiding unwanted
cross-talk. Multiple independent target phase profiles with quantified phase
relations that can process significantly different information in different
polarization states are realized within a single metasurface. For our
metasurface holograms, we demonstrate high fidelity, large efficiency,
broadband operation, and a total of twelve polarization channels. Such
multichannel polarization multiplexing can be used for dynamic vectorial
holographic display and can provide triple protection for optical security. The
concept is appealing for applications of arbitrary spin to angular momentum
conversion and various phase modulation/beam shaping elements.
