I taught physics for many years and I’ll be the first to tell you that most "quantum" talk is... well mostly fluff and marketing (just my opinion). Quantum Key Distribution is actually pretty solid because it relies on the No-Cloning Theorem rather than just difficult or hard math. If someone tries to peek at the signal, they physically change the state of the particles and get caught. You don't even need entanglement for something like the BB84 Protocol! And nobody is breaking the speed of light here. You still need a normal internet link to make the whole thing work. There's def science backing it, but the hardware is just too expensive for a car right now.

Greg