Faster-than-light communication is probably impossible. Here’s why.
Faster than light communication is a dream but also an impossibility according to known physics. We’d better get used to it.
We all know the trope.
Two people, light years apart, communicate instantaneously through entangled black holes. This happens right before their deaths, and they won’t be able to share their conversation with anyone else.
At least, that is the implication of ER=EPR, the conjecture that entangled particles, particles that share a quantum state, are connected by an Einstein-Rosen bridge or wormhole.
The conjecture comes from a theory that two entangled black holes would form a wormhole between them. This means that if two black holes, A and B, are lightyears apart, and Alice falls into A and Bob falls into B, then Alice and Bob theoretically could meet as they fall towards the singularity.
This meeting would allow an exchange of information between them, effectively faster than light communication, but, since both are stuck behind the event horizon, neither could, in any way, communicate that information to the outside world. They would subsequently die as the tidal forces upon them approach infinity near the singularity and they are spaghettified.
