Why wouldn’t they aim the photons and use line of sight?
the distance possible for line of sight is hampered by the curvature of the earth.
also, ‘instantaneous’ and much faster then the speed of light.
if, indeed, they’ve got quantum entangled particles... changing one on earth would -instantly- change the other on mars. if it were light based, and ignoring the issues with line of sight, it would take light between 3 and 22 minutes to reach the earth (depending where each is in their orbit relative to each other)
-instant- is a whole different level.
it would also allow for a whole new generation of manned robotic vehicles taking tele-presence a step closer to reality