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Quantum entanglement appears to create correlations between entangled particles instantaneously, no matter how far apart they are, which has led some to think of it as “faster than light.” However, entanglement doesn’t transmit information in a way that violates the speed of light limit in special relativity.

Here’s why: when two particles are entangled, measuring the state of one particle instantly determines the state of the other. But this “spooky action at a distance” doesn’t allow for faster-than-light communication because the outcome of measurements on entangled particles is random. Only when the results from both particles are compared—which can only be done by a slower-than-light transmission—do we see the correlation.

In short, while entanglement correlations happen instantaneously, it doesn’t allow any usable information to travel faster than light.