Teleportation is real!


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Teleportation is real!

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jul. 12, 2017, 3:04 pm

Chinese researchers have teleported a photon from the Gobi desert to a satellite orbiting five hundred kilometres above the earth.

This is achieved through quantum entanglement.

Of course.

jul. 12, 2017, 8:07 pm

Are you surprised? ;-)

jul. 12, 2017, 9:01 pm

Eh. Nothing radical. Just doing what we already know can be done. Theoretically it could be done with entangled photons a billion light years apart. So to speak ;)

Editat: jul. 12, 2017, 10:10 pm

That's good to know. Thanks!

ETA: please forgive my ignorance as a poor biologist but I thought photons can do that all by themselves. Is it that they are transported faster than the speed of light?
Vision physiologists want to know. Thanks. 🙂

jul. 12, 2017, 10:44 pm

>4 krazy4katz: I'm no physicist, and this is an awfully difficult topic to describe unless you are incredibly clear on a matter of very active investigation. I'm not sure what you have in mind when you say that photons can do that all by themselves. But this phenomenon of quantum entanglement refers to a counterintuitive phenomenon in which a pair of particles behaves as if their quantum properties are linked even when they are separated by vast distances in space. Einstein famously objected to this behavior as "spooky action at a distance", but experiment supports that things can in fact work this way. As I understand it, the comment we non-physicists often hear on the issue of faster than the speed of light is that "no actual information is passed" and thus special relativity is never violated. Beyond that, I'll let you know after I go back to school to get my physics PhD. That will not be soon. Hope that helps!

jul. 13, 2017, 12:49 pm

Thank you Stella! I appreciate your explanation.

Editat: jul. 15, 2017, 9:32 am

I've already got my physics PhD, so I can confirm that photons travel at the speed of light (like it says on the tin), and not any faster. Entangled states are always produced through two (or more) particles interacting at the same place(s). Those particles then have to be physically separated, which happens at or below the speed of light, depending on the type of particles entangled.

This is emphasized in the written story that accompanies the video linked by 2wonderY. I only skimmed it, but it seems to be quite well written and explains how the entangled photons were "created at the same time and place" and half of each pair were put into a beam of light shining at the satellite.

While stellarexplorer is right that quantum teleportation of this sort has been around for 20 years (first proposed in 1993, first realized in 1997, and the subject of a school report I wrote in 2004), this work claims a major advance in the scale on which it can be realized. This is significant since entangled states are very "fragile", in the sense that they easily break down due to either particle interacting with its environment. If you wanted to create an entangled state a billion light years across, you would need to protect each particle from any significant interaction with any external influences for (half) a billion years, which is easier said than done.

The Wikipedia article on quantum teleportation currently lists 143 km as "The record distance for quantum teleportation", compared to the "up to 1400 km" claimed by this work.

jul. 15, 2017, 10:13 am

Thanks for the explanation, daschaich!

jul. 15, 2017, 10:57 am

So Prot in K-Pax was telling the truth: he did travel by light.

feb. 19, 2018, 6:02 am

An update from last month on more recent work being done with this Micius satellite: Intercontinental, Quantum-Encrypted Messaging and Video.

març 7, 2018, 11:16 am

>10 daschaich: That boggles my mind. My biggest experience with encryption was with PGP when you could download it for free from the university where it was created. I tried for a short time to sell copies "before the government put a back door in it" but my few prospective customers were not impressed with the need for privacy evidently {or had consumed less beer than I thought}.

Going off topic slightly, I see where CERN {you still work there?} is bringing Star Trek to life by transporting antimatter. My van with 200k+ miles could use a make over - any chance you folks are powering the van with antimatter? ;-)

CERN to Transport Antimatter in a Van to Study Neutron Stars

març 12, 2018, 4:05 pm

No, I haven't been at CERN since '05, though I'm currently just one letter away in Bern. By coincidence, it's also been about that long since I've played with GPG.

I'm sure you know this, but let me remind more casual readers that antimatter is not a source of power but instead needs to consume power to be produced.

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