2 ms·
Geeze that's a lot of words to explain something so simple. Lets say you use pure energy to create a particles with a non zero spin (substitute a charge if spi
by rstuart4133 8y ago
Geeze that's a lot of words to explain something so simple.
Lets say you use pure energy to create a particles with a non zero spin (substitute a charge if spin is confusing) that immediately separate from each other at high speed. The rules of the universe demand that the sum of the spins (or charges) equals 0: eg if one is an electron the other must be a positron. So now you have two particles flying towards you and me, but no one in the universe knows which is which except possibly the particles themselves, so we say they are entangled. If I look at the particle coming towards me I have no way of knowing if I will see a positron or a electron. When I do look, I know what you will see if you look. Which is nice, but no information has passed from me to you. Instead have both learnt something new. The definition of communication is you pass some knowledge you knew before the process started onto me. (In fact we learnt the same thing.)
The word entanglement seems to imply if one particle changes the other undergoes a corresponding change. Whether that's true or not is a bit of a mystery. In any case it doesn't matter how it happens. Even if there was a "global variable" and even if it suddenly changed value when one of us observed it, merely observing it destroys the entanglement. So yes we both learnt something new and maybe it was communicated faster than the speed of light, but we now know the first observation doesn't communicate any information we knew before. And because observing it destroyed the entanglement no new information can be transmitted.