Re:Rumours swell over new kind of gravitational-wave sighting
by grepthisab on Saturday August 26, 2017 @09:29PM
(#15108518)
So why not communicate via quantum entanglement? Kind of like FTL TCP.
Re:Rumours swell over new kind of gravitational-wave sighting
by int_19h on Sunday August 27, 2017 @07:46AM
(#15110339)
How would you do that? You can't force the entangled photon at the other end of the channel to measure in any particular way. Once you've measured yours, the other one will measure the same, yes - but you don't know what yours will be until you measure, and the probability is 1/2 either way.
If you observe one of a pair of entangled particles, you will see one of its possible values. Entanglement only means anything when you compare it's value with its pair's value, and that comparison is limited to the speed of light.
So, yes, in a sense quantum entanglement is free of all the causality issues brought by GR. But it does not really exist until the pair can communicate.