Hence the conclusion that it can't be used for purposes of communication, or the sending of information of any kind ~ or even for sending negative-information of nothing at all.
That does not mean we can't get around those limitations eventually. Scientific observation of aggregations/groups of entangled photons is a really new field and few can begin to guess what that will lead to.
As early as 1990 AT&T was working on using entanglement to assist in protecting encrypted messages. Last time I looked at that they'd overcome many hurdles ~ but the big idea was that sometimes no information is the answer.
My understanding is that entanglement can't be used for communication since the process presumably of interest to us is instantaneous and since nothing can exceed the speed of light, then it doesn't really exist, or it's a misunderstanding, or all sorts of other reasons why somebody doesn't want it to be of use.
I do believe research into entanglement has advanced way beyond that. But the top dogs aren't talking!
Some of us are old enough to remember how laser research and technology went underground for more than 20 years. Just flat out disappeared.
Yes, the big issue is that people, at least lay people, want this to be some supraluminal technology, when it doesn’t appear to fit that purpose. That doesn’t mean it won’t be very useful in some other purpose though.
Personally, I think trying to cross the “light barrier” will prove to be foolish. People think of the speed of light as a speed limit, when really it is the only speed there is. Everything travels at the speed of light, including matter, when you look at things in Minkowski space. We are just constantly travelling at the speed of light (or quite near to it) in the time dimension, while photons are travelling at the speed of light in the spatial dimensions.
Once you realize that, then it also solves the question of why we experience only the current moment of time, and cannot see the future or the past (except reconstructed in our memory). Since we travel at near the speed of light in the time direction, that dimension will shrink to nearly a point due to length contraction, just like spatial distances shrink to a point for photons travelling at the speed of light.