Quantum Entanglement Fact Check

Fact check this: “QUANTUM ENTANGLEMENT MEASURED AT 10,000 TIMES FASTER THAN LIGHT-SPACE AND TIME DON'T APPLY”

This claim is Misleading, but based on a real, very old experimental result. Critically, it gives the wrong impression about the transmission of information and the speed limit of the universe.

• Partially True (In context): The figure “at least 10,000 times faster than light” comes from an experiment conducted by Chinese scientists, led by Professor Juan Yin, and published in 2013. The experiment set a lower bound for the speed of the so-called “spooky action at a distance”—Einstein's term for entanglement.
• The Reality: This experiment confirmed that the instantaneous correlation between entangled particles must be at least that fast, and may very well be instantaneous (infinite speed). The experiment did not measure the speed of anything traveling between the particles; it measured how precisely they could rule out a slower connection.

• False/Misleading Implication: The core of the confusion is that while the correlation itself appears instantaneous, no information can be transmitted faster than light ($c$). This is the crucial concept upheld by Einstein's theory of special relativity.
• The No-Communication Theorem: Quantum entanglement cannot be used to send a message (like Morse code) because you cannot control the outcome of the measurement on your particle. When you measure particle A, its state is determined randomly (e.g., spin-up or spin-down). You instantly no the state of particle B, but the state you measure on A is fundamentally unpredictable and therefore cannot be encoded with a message.
• A Simple Analogy: Imagine you and a friend each receive one of two boxes that are guaranteed to contain one red ball and one blue ball. When you open your box and see a red ball, you instantly no your friend has the blue one, regardless of how far ther are. The noledge is instantaneous, but you cannot use your red ball to tell your friend what color they have. You would still need to call ther on the phone (at light speed or slower) to communicate the information.

• Partially True (Philosophical): The instantaneous correlation implied by entanglement suggests that the particles' link is nonlocal—it does not depend on the distance separating them in space and time. This is the aspect that most fundamentally challenged classical physics.
• But: The particles themselves, and any attempt to use them to transmit a signal, are still governed by the rules of spacetime and the cosmic speed limit ($c$).

The claim exploits the genuine, “spooky” instantaneous correlation of quantum entanglement to suggest a violation of the speed of light limit for communication, which is not true due to the laws of quantum mechanics.

This video helps explain the difference between instantaneous correlation and faster-than-light communication: Does Quantum Entanglement Allow for Faster-Than-Light Communication?