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Can quantum entanglement provide a faster way of transfer of information than the speed of light as it travells at a speed which is 10000 times faster than the speed of light

user73034
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4 Answers4

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I want to add a point: entanglement not only does not allow for faster than light communication, but entanglement alone does not allow for any communication at all! By the no communication theorem local operations on a quantum system cannot cause measurable consequences to a far away quantum system, entanglement notwithstading.

Entanglement can be used to improve communication, such as with superdense coding, but all such protocols require physical transmission of bits or qubits, which of course is limited by special relativity.

user2723984
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Short answer: No.

Longer answer: No, it doesn't. There is no way to use entanglement to communicate faster than the speed of light.

If you want an answer that's more detailed than that, you will need to provide a more detailed question explaining why you thought otherwise.

Emilio Pisanty
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No.

In a very oversimplified explanation: entangled particles will have the opposite 'spin' along their axis of measurement. If you wanted to encode data into them, there isn't really any way to do that, the only input you could have is to measure them along an axis, which does nothing to help you communicate with an observer.

You could theoretically use it as a verification key, I guess. If you measure all your particles along a consistent axis you will have a binary string as a result, somebody with the entangled particles could then measure their particles along the same axis and have the exact opposite binary string - thus identifying eachother as being from the same origin. But you can't really use that to communicate.

EDIT: here is a similarly oversimplified video saying this more intuitively (https://www.youtube.com/watch?v=ZuvK-od647c)

crgowen
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You have two shoes: left one, and right one.

Your mom quietly pack into cartoon every shoe, separately, and sent one package to your girlfriend, and the second to you.

You have this present, open it and it is left! Immediately you know, your girlfriend has right!

Speed of light is nothing compared to the speed you know something about shoe your girlfriend has! You are amazing.

Excercise: Try to use it to communicate something to your girlfriend...

kakaz
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