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burke142
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I'm wondering whether or why quantum entanglement swapping or steering could or couldn't be used for superluminal communication. Below is a thought experiment. Setting aside the technological barriers do the laws of physics prevent this?
On Earth Base Alpha:
EPR Sources Entangle Numbered Particle Categories into Particle Pairs:
1 & 2 (first)
3 & 4 (then)
2 & 3 (then, finally)
Before particle 3 & 4 entanglement, sensors measure the quantum state of particle 1 and thus determine the anti-correlated quantum states of both particles 1 & 2.
Particle 1 is destroyed or discarded, category 2 particles are grouped into 2 separate containers by their already determined quantum state (e.g., 2A, 2B; where A: up spin, B: down spin, etc.).
Next, particles 3 & 4 entangle.
Then, particles 3 & 4 are sorted into their respective containers and “captured in sequence” in the same order each particle is entangled & received.
Alpha Base: retains the containers of particles: 2 & 3.
A rocket ship transports the particle 4 container to Moon Base Beta.
Alpha Base sensors begin taking “projection measurements” of particles 2 & 3, thus entangling them.
Beta Base sensors take slightly delayed measurements of the individual 4 particles which are the companions to 3 particles (which were just entangled with 2 particles).
With this process, Alpha Base can “steer” the quantum state of category 4 particles.
That is, by entangling particle 3 with 2A particle, particle 4 spins down; or spins up for particle 3 & 2B entanglements. Because of the slight delay, particle 4 measurements alerts Beta Base to Alpha Base’s steered quantum state choice.
Therefore, by modulating particle 3 & 2A and 3 & 2B entanglements, Alpha Base transmits and Beta Base receives superluminal Morse code.
Does this violate relativity?
On Earth Base Alpha:
EPR Sources Entangle Numbered Particle Categories into Particle Pairs:
1 & 2 (first)
3 & 4 (then)
2 & 3 (then, finally)
Before particle 3 & 4 entanglement, sensors measure the quantum state of particle 1 and thus determine the anti-correlated quantum states of both particles 1 & 2.
Particle 1 is destroyed or discarded, category 2 particles are grouped into 2 separate containers by their already determined quantum state (e.g., 2A, 2B; where A: up spin, B: down spin, etc.).
Next, particles 3 & 4 entangle.
Then, particles 3 & 4 are sorted into their respective containers and “captured in sequence” in the same order each particle is entangled & received.
Alpha Base: retains the containers of particles: 2 & 3.
A rocket ship transports the particle 4 container to Moon Base Beta.
Alpha Base sensors begin taking “projection measurements” of particles 2 & 3, thus entangling them.
Beta Base sensors take slightly delayed measurements of the individual 4 particles which are the companions to 3 particles (which were just entangled with 2 particles).
With this process, Alpha Base can “steer” the quantum state of category 4 particles.
That is, by entangling particle 3 with 2A particle, particle 4 spins down; or spins up for particle 3 & 2B entanglements. Because of the slight delay, particle 4 measurements alerts Beta Base to Alpha Base’s steered quantum state choice.
Therefore, by modulating particle 3 & 2A and 3 & 2B entanglements, Alpha Base transmits and Beta Base receives superluminal Morse code.
Does this violate relativity?
