Personally, I don't think such a thing exists.
Dutch researchers are proposing using something they call quantum-secure authentication - a nanoparticle strip that has a unique pattern carved into it by a laser.
They claim it can't be hacked.
The hackers of the world slaver at such claims. I'm not sure even quantum physics can end the arms race between the white hats and black hats of the world. There's a good explanation of how the system would work here.
What do people think? Is this really "unhackable"?