Twisted light. Polarized in a new and different way? Or a way I just never heard of? Really? Or maybe it’s just a new application of circular polarization? Not sure. But anyway, 2.5 terabits of information a second would be nice to have for communicating in space, between probes and the homeworld. Between homeworlds in the cosmic civilization-scale jetlag.
Twisted lights in the sky
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They’re playing with the helicity of the transmitted waves as the dominant carrier, instead of the polarization. I’m unsure how robust these signals are (they only managed to transmit about a meter) and you need to make sure you’re focused point-to-point, but it’s still cool and the pictures are pretty.