FTL Communications?

[MasterGwydion]

Just saw this and thought it was interesting.

Scientists achieve teleportation between quantum computers for the first time ever

Researchers have used the teleportation trick to forge a working logic gate between two separate quantum chips.

www.earth.com

 

[Terry Mixon]

Just saw this and thought it was interesting.

Earth and Environmental News, Videos and Images

At Earth.com, our goal is to provide the internet with a homepage for anything and everything about our planet Earth and the environment.

www.earth.com

This is just a link to the general page. Is there a specific article you were referencing? And, please, clean up the url to remove all the junk at the end.

 

[MasterGwydion]

This is just a link to the general page. Is there a specific article you were referencing? And, please, clean up the url to remove all the junk at the end.

Did that fix it?

 

[Terry Mixon]

Did that fix it?

Yes. Thank you. Reading now.

 

[Terry Mixon]

It looks interesting. The holdup for FTL communications across stellar distances would be the entangled pairs. Once created, they would still need to the separated and one half carried off to the other end. And, unless I misremember, they have to be replaced and the entanglement can come apart. Not sure of the specifics, but it would make things challenging. Still, that’s an Ancients Ansible in its baby form.

 

[Limpin Legin]

Teleportation, one photon at a time:

This breakthrough demonstrates quantum teleportation, a process where the state of a particle (like a photon) is transferred to another distant particle without the initial particle moving physically.

"Impossible" quantum teleportation achieved on normal internet cables

Scientists accomplished quantum teleportation over busy internet lines, meaning special lines may not be required for quantum communication.

www.earth.com

 

[MasterGwydion]

Like I said, interesting. No bearing on Traveller, but it's cool.

 

[Limpin Legin]

Scientists Reverse Arrow of Time in Quantum Experiment

The idea of unidirectional time––time that does not solely move forward––seems to hold true for life and objects on a human scale.

www.pbs.org

Well, according to an entirely different quantum experiment, we may be able to go back in Time, and change Traveller

 

[Sigtrygg]

Quantum entanglement does not allow FTL communication.

 

[MasterGwydion]

Then how long did it take to transmit the data across 6 feet in this experiment? Lightspeed?

 

[Limpin Legin]

As physicist Richard Feynman wisely noted, “If you think you understand quantum mechanics, you don’t understand quantum mechanics.”

 

[Condottiere]

As long as the mechanics can disentangle quantums.

 

[MasterGwydion]

The article doesn't mention how long it took between sending and receiving, so Sig could be right.

 

[Terry Mixon]

The article doesn't mention how long it took between sending and receiving, so Sig could be right.

It's not really a matter of sending and receiving. It's more that you can't interpret what the matched spin means because the spin is not something that can be controlled. It's random. If you check one end, you find that both are spinning up. As no one could know that in advance, it means nothing.

 

[Sigtrygg]

Or as wikipedia puts it:
"quantum teleportation only transfers quantum information. The sender does not have to know the particular quantum state being transferred. Moreover, the location of the recipient can be unknown, but to complete the quantum teleportation, classical information needs to be sent from sender to receiver. Because classical information needs to be sent, quantum teleportation cannot occur faster than the speed of light."

If you want a bit more:

 

[MasterGwydion]

I was not aware that "information" was something governed by the speed of light. All of the ways that We are aware to "send" the data, so far, have that restriction, but the "information" has no speed limit.

 

[Sigtrygg]

Causality. Information can not be sent faster than light.

 

[MasterGwydion]

Causality. Information can not be sent faster than light.

Causality depends on a viewpoint. From one viewpoint, the event happens, then the effect happens. From another viewpoint, the effect happens, then the event happens.

 

[rinku]

Events happen in isolation simultaneously, but the *information* about one event arriving where the second event occurred is constrained by speed of light. There can be no causality faster than lightspeed.

Quantum entanglement is like secret orders. You can draft a sealed letter and send copies to all your generals, to be opened at a particular date and time. But the various generals are not actually in communication with each other, even if they act simultaneously. The causality is between the Commander and each general seperately, at the speed of post.

If one general failed to open their orders, the others will not know until later. They, and the overall commander can HOPE or ASSUME they did, but they won't KNOW until information arrives from the field.

 

[MasterGwydion]

Events happen in isolation simultaneously, but the *information* about one event arriving where the second event occurred is constrained by speed of light. There can be no causality faster than lightspeed.

Quantum entanglement is like secret orders. You can draft a sealed letter and send copies to all your generals, to be opened at a particular date and time. But the various generals are not actually in communication with each other, even if they act simultaneously. The causality is between the Commander and each general seperately, at the speed of post.

If one general failed to open their orders, the others will not know until later. They, and the overall commander can HOPE or ASSUME they did, but they won't KNOW until information arrives from the field.

Except it is two-way communication. When the "orders" are "opened", it "sends" a signal back to the original particle. Then the commander knows if the orders have been received or not. Also, are you taking retrocausality into account?