FTL signals connected to a previous non-FTL discussion are possible?

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SUMMARY

The discussion centers on the feasibility of faster-than-light (FTL) communication using quantum entanglement between Earth and a distant star system. Participants propose a scenario where both locations utilize entangled photon pairs to synchronize probe launches based on photon spin measurements. The conversation highlights the distinction between photon polarization and spin, emphasizing that while entangled photons can facilitate instantaneous communication, alternative methods, such as a glove factory analogy, can achieve similar outcomes without quantum mechanics. The consensus indicates that while the proposed method is theoretically possible, it presents significant practical challenges.

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  • Quantum mechanics fundamentals, particularly quantum entanglement
  • Understanding of photon polarization versus spin
  • Basic principles of deterministic modeling in orbital mechanics
  • Familiarity with communication protocols in quantum systems
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  • Explore the implications of quantum entanglement on communication speed
  • Research the differences between photon polarization and spin-1/2 particles
  • Investigate deterministic modeling techniques in astrophysics
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Physicists, quantum mechanics enthusiasts, and researchers interested in the theoretical aspects of FTL communication and quantum entanglement applications.

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This is a thought experiment…

Suppose one day we established a space station exactly halfway between earth and another star in distant space,

From this station we fire off entangled pairs of photons, one goes to the other star and one goes to earth , the star and earth each have detectors set to angles known to each other

We fire off each pair at a rate of one per second . Prior to this setup , we had a standard conversation with the star and the game was agreed to
So basically assume both the star and earth have high-tech machines and a mapping of natural changes in orbit such that the detectors will always be the same settings on star and earth, and the ship in between earth and star will move in such a way that the alignment will be exactly halfway in between the star and earth …. By deterministic modeling of the orbiting systems of earth and the other star

After 10000 years of dry runs and planning , earth and the star are in on the game :

Both beings on the star system and earth will EACH receive photons flying in from the halfway station at one per second ,

Both earth and the star have from past dry-runs confirmed their setup is such that whenever they measure their photon with spin-up, the other star will always find their photon will have spin-down and it’s because these pairs arriving concurrently are entangled pairs of photons

Earth will assume the star system is running the same detecting game as the star and we won’t know or be able to tell if they are in real time but we discussed it with them over thousands of time-delayed years of sending and receiving light signals

The game : once the other star receives 67864 spin-ups , we will launch a probe ,

The other star will launch a probe at that same instant

At that moment 67864 spin-ups have been counted , we don’t know when that will happen in advance , nor does the other star , it’s in the hands of quantum mechanics but this is very difficult though to pull off though not mathematically impossible in the laws of quantum mechanics , am I right ?
 
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berkeman said:
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Isn’t the moment of realization that the game objective is achieved , unknown beforehand to both , ir-retrievable beforehand, and delivered without travel through space ? Where as any other pre-plan not using quantum entanglement would involve knowability of the moment of the launch in a hidden predetermined formula or otherwise agreed upon time of actions, or observation that would have to account for both localities (ex the time the farther star witnesses a supernova)?
 
ESponge2000 said:
whenever they measure their photon with spin-up, the other star will always find their photon will have spin-down and it’s because these pairs arriving concurrently are entangled pairs of photons
A small point: If we're using photons we're aren't talking about spin, we're talking about polarization and the choices are vertical and horizontal. The things that spin up or down are spin-1/2 particles like electrons.

The bigger point: Instead of using entangled pairs of photons, we could set up a glove factory in the station. It manufactures pairs of gloves, and then randomly sends one glove to star and one to earth... and whoever gets a left-handed glove knows that their counterpart received a right-handed glove. Same communication protocol, no entanglement or quantum mechanics involved.
 
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Or one practicality of basic quantum entanglement in quantum mechanics is that you can play any number of games of random chance across spaces ,(or by extension of special relativity , across space time) amongst 2 or more distinct locations , upon which the outcomes can’t be pre-determined
 
Nugatory said:
A small point: If we're using photons we're aren't talking about spin, we're talking about polarization and the choices are vertical and horizontal. The things that spin up or down are spin-1/2 particles like electrons.

The bigger point: Instead of using entangled pairs of photons, we could set up a glove factory in the station. It manufactures pairs of gloves, and then randomly sends one glove to star and one to earth... and whoever gets a left-handed glove knows that their counterpart received a right-handed glove. Same communication protocol, no entanglement or quantum mechanics involved.
I thought about this as well, though the key difference in this case is of course that not exclusively the 2 observers can potentially observe the count in the game so it lacks the same encryption
 
Also are photon particles heterogeneous and this is why the photoelectric effect showed that the largest number of photons of yellow light was still far far less powerful than a dim blue light ?
 
What does any of this have to do with FTL?
 
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PeterDonis said:
What does any of this have to do with FTL
I agree.

I think the OP would do well to come up with a question that eliminates all the extraneous stuff (and doesn't take 12 paragraphs to ask) so people can focus on what is important. He will likely get better answers this way.
 

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