New method of quantum entanglement increases the information that can be carried • Hacker News Board

Re: New method of quantum entanglement increases the information that can be carried

#21

Post by ikeboy » Wed, Jul 01, 2015, 10:56 AM UTC

therein wrote: post #20

ikeboy wrote: post #13

Earlier quoted context omitted.

>If we can use the quantum entanglement to determine if some Eve has intercepted a message between Alice and Bob, then why can't we use the fact of tampering as the data pipe? You can't; quantum key distribution requires a classical channel as well. See https://en.wikipedia.org/wiki/Quantum_key_distribution#BB84_... >After Bob has measured all the photons, he communicates with Alice over the public classical channel.…

I was thinking of that too. Do you think that would add additional latency as the entanglement needs to boot and initialize? It also feels like we would be wasting some bandwidth because the tampering of the pipe will give us 1-bit of information rather than the pipe providing us with four. But hey, it is FTL anyway.

It is not FTL. There is no way to use this to communicate FTL.

Was my explanation lacking?

Re: New method of quantum entanglement increases the information that can be carried

#22

Post by ikeboy » Wed, Jul 01, 2015, 10:59 AM UTC

omnipedal wrote: post #19

omnipedal wrote: post #16

Earlier quoted context omitted.

It's only 2015, I think it's a little ridiculous to make far sweeping conclusions about whole realms of science supposedly not working based on limited current understanding of science.

Scientists know very little about QM despite it being known for 80 years due to political, resource and human IQ restraints. The human knowledge in this area is not even in infancy yet. The experiments on Quantum Entanglement have only begun to intensify in recent years. With the advent of AI and commercial interest in the field due to communication opportunities, this may change rapidly. When you say FTL communicati…

Again: what part of QM is little known about? It's made predictions accurate to tens of decimal places, none of its predictions have been disproven.

Re: New method of quantum entanglement increases the information that can be carried

#23

Post by olewhalehunter » Wed, Jul 01, 2015, 2:48 PM UTC

ikeboy wrote: post #21

therein wrote: post #20

Earlier quoted context omitted.

I was thinking of that too. Do you think that would add additional latency as the entanglement needs to boot and initialize? It also feels like we would be wasting some bandwidth because the tampering of the pipe will give us 1-bit of information rather than the pipe providing us with four. But hey, it is FTL anyway.

It is not FTL. There is no way to use this to communicate FTL. Was my explanation lacking?

Alice and Bob are friends born on planet X who now live on planets Y and Z respectively each a light year away from X on opposites sides. Bob's mom on X dies, and the news on intergalactic social media is beamed to planets Y and Z where Alice and Bob learn of the news. In an instant after the year it takes the news to reach him Bob realizes that 2 light years away Alice will be sad, she might take a few days off work, her already strained relationship with her father will worsen, and that more than likely she will be returning to X...all sorts of meaning and information is communicated. Is the information "from Alice"? What information is "from Alice"?, when she and Bob next meet on planet X and tells him in person how devastated she is, was it Alice that really generated that information? Was it Alice's nervous system? Was it the event of the death itself or the transmission of it? Alice didn't "will" her sadness into existence nor the communication of it, nor any meaning in her life to be communicated, I don't think we communicate anything a priori because that would be useless. Do humans really generate any information at all that doesn't come from entangled systems?

Re: New method of quantum entanglement increases the information that can be carried

#24

Post by ikeboy » Wed, Jul 01, 2015, 5:15 PM UTC

olewhalehunter wrote: post #23

ikeboy wrote: post #21

Earlier quoted context omitted.

It is not FTL. There is no way to use this to communicate FTL. Was my explanation lacking?

Alice and Bob are friends born on planet X who now live on planets Y and Z respectively each a light year away from X on opposites sides. Bob's mom on X dies, and the news on intergalactic social media is beamed to planets Y and Z where Alice and Bob learn of the news. In an instant after the year it takes the news to reach him Bob realizes that 2 light years away Alice will be sad, she might take a few days off work…

>Is the information "from Alice"?

No.

> when she and Bob next meet on planet X and tells him in person how devastated she is, was it Alice that really generated that information? Was it Alice's nervous system?

Yes. The info may also have had an earlier cause, but that is completely screened off by Alice (in the technical sense of screen; see http://plato.stanford.edu/entries/causation-probabilistic/#S...).

>Do humans really generate any information at all that doesn't come from entangled systems?

I think you don't understand what entangled means; if I take two envelopes and put a 1 in the first and a 0 in the second, the envelopes aren't "entangled". Entanglement has a specific meaning, and doesn't just mean correlation. See https://en.wikipedia.org/wiki/Bell's_theorem

Anyway, you seem to have some confusion over determinism and physics, but it doesn't really have to do with FTL.