18 ms·

Thanks, this helps a lot, but just to clarify: Originally "We 'shine' a bunch of photons at an object, and see if they come back. Except there could be dragged

Thanks, this helps a lot, but just to clarify: Originally "We 'shine' a bunch of photons at an object, and see if they come back. Except there could be dragged decoy spamming photons back at us, and we don't know if there is. Or it could be sending out so much light, our photons coming back are lost in the mix." With quantum: "We can verify that any photons that get reflected are the ones that we sent out and check only our photons when flooded with photons from enemy flashlights." Right?

Filligree 8y ago
Right. Oversimplifying a lot, it's putting a name tag on the photons. Then you can sort out the tagged ones from all the others, drastically reducing the practical noise floor.
- misterprime 8y ago
  Interesting. Is generating entangled protons so trivial that this is feasible now? It seems like it would take millions (more?) of entangled protons per second to achieve this. And then these can be sensed, verified, and measured at such speed that it could be used as radar? It sounds far fetched, but I would love to know if this process is already that quick and easy.
- renox 8y ago
  Except that photons don't have tags.. Each time a story talk about entanglement, I'm stuck: what does it mean experimentally to verify that two particles are entangled? I don't know..