3 ms·

Correct me if this sounds noobish. So they have teleported state that has Information that can be decoded to bits and bytes(?) Forget about human teleportation

by itissid 10y ago

Correct me if this sounds noobish. So they have teleported state that has Information that can be decoded to bits and bytes(?) Forget about human teleportation for a sec, isn't this a big deal in a not so far future for telecommunication?

tgb 10y ago
Actually, they've done almost the reverse. To quantum teleport one qubit you have to transmit two classical bits, say by ethernet. In no way can this replace classical communication, it depends upon it.
onli 10y ago
They did nothing of the sort. Quantum physicists use words like teleport to say completely different things then what those words actually mean.
- njwnought 10y ago
  This is correct. I'll quote the article here: "What happened is the instantaneous and disembodied transfer of the photon’s quantum state onto the remaining photon of the entangled pair, which is the one that remained six kilometres away at the university,” says Tittel". So teleport in this case doesn't really mean teleport, it just refers to the "teleportation" or transfer of a quantum state.
  - j1vms 10y ago
    I am not a career physicist, but have read much and thought deeply about these things. > So teleport in this case doesn't really mean teleport I would disagree with this statement. For all intents and purposes, the photon receiving the "transfer" is now indistinguishable from the photon that was transferred, before the event took place. That is to say, it has a completely identical quantum state following the transfer, and the "original" photon no longer has that "original" quantum state. They are only separate in space, and the transfer event took place at a defined "instant in time". It is is indeed ok to call this teleportation as (although this might seem odd in the practical sense) it is not possible to prove that the original photon was not teleported through space-time.
jdmichal 10y ago
See my top-level post: https://news.ycombinator.com/item?id=12548733 https://news.ycombinator.com/item?id=12548733

by itissid 10y ago

tgb 10y ago

Actually, they've done almost the reverse. To quantum teleport one qubit you have to transmit two classical bits, say by ethernet. In no way can this replace classical communication, it depends upon it.

onli 10y ago

They did nothing of the sort. Quantum physicists use words like teleport to say completely different things then what those words actually mean.

njwnought 10y ago
This is correct. I'll quote the article here: "What happened is the instantaneous and disembodied transfer of the photon’s quantum state onto the remaining photon of the entangled pair, which is the one that remained six kilometres away at the university,” says Tittel". So teleport in this case doesn't really mean teleport, it just refers to the "teleportation" or transfer of a quantum state.
- j1vms 10y ago
  I am not a career physicist, but have read much and thought deeply about these things. > So teleport in this case doesn't really mean teleport I would disagree with this statement. For all intents and purposes, the photon receiving the "transfer" is now indistinguishable from the photon that was transferred, before the event took place. That is to say, it has a completely identical quantum state following the transfer, and the "original" photon no longer has that "original" quantum state. They are only separate in space, and the transfer event took place at a defined "instant in time". It is is indeed ok to call this teleportation as (although this might seem odd in the practical sense) it is not possible to prove that the original photon was not teleported through space-time.

jdmichal 10y ago

See my top-level post: https://news.ycombinator.com/item?id=12548733 https://news.ycombinator.com/item?id=12548733