[The Cajun]

That means that photons maintain the principle of causality laid out in Einstein's theory of special relativity - that is, an event's effect cannot precede its cause by travelling faster than light.

Yea, yea right, but what about 2 entangled photons able to communicate their spin state instantaneously irregardless of their distance?

[blasater1960]

Yea, yea right, but what about 2 entangled photons able to communicate their spin state instantaneously irregardless of their distance?

Always wondered about that! Must have built-in superluminal telepathic cell phones...lol

[catnipman]

“Yea, yea right, but what about 2 entangled photons able to communicate their spin state instantaneously irregardless of their distance? “

Yep. Definitely puts the kibosh on the theory that everything that happens in universe must go slower than “c”. Just because photons and electromagnetic-waves may not be able to travel faster than “c”, that does not mean that everything that happens in the universe must go slower than “c”.