No, We Still Can’t Use Quantum Entanglement To Communicate Faster Than Light
“There’s an awful lot that you can do by leveraging the bizarre physics of quantum entanglement, such as by creating a quantum lock-and-key system that’s virtually unbreakable with purely classical computations. But the fact that you cannot copy or clone a quantum state — as the act of merely reading the state fundamentally changes it — is the nail-in-the-coffin of any workable scheme to achieve faster-than-light communication with quantum entanglement.
There are a lot of subtleties associated with how quantum entanglement actually works in practice, but the key takeaway is this: there is no measurement procedure you can undertake to force a particular outcome while maintaining the entanglement between particles. The result of any quantum measurement is unavoidably random, negating this possibility. As it turns out, God really does play dice with the Universe, and that’s a good thing. No information can be sent faster-than-light, allowing causality to still be maintained for our Universe.”
You might think that if you have two entangled quantum particles, you can separate them by a large distance, make an observation of some physical property at one location, measure your member of the entangled pair, and use that existing entanglement to send information about what you observed instantaneously to anywhere in the Universe. It’s a brilliant and clever idea, and it turns out it’s absolutely forbidden by the laws of physics.