The concept of communicating through "subspace" in the science fiction franchise "Star Trek" is loosely inspired by real-world quantum mechanics principles, such as quantum entanglement.  Quantum entanglement is a phenomenon in which particles become connected in such a way that the state of one particle instantly influences the state of another, regardless of the distance between them, but has only been experimentally demonstrated in the real world at relatively short distances compared to interstellar space and currently there's no way to send information this way.  Subspace is simply a fictional method of communication that allows ships to transmit messages over long distances faster than light speed, which is considered impossible according to current scientific understanding.

It's worth noting that while many elements of "Star Trek" were inspired by real-life science and technology, the show does take creative liberties with scientific concepts for the sake of telling an entertaining story. Therefore, it should not be viewed as a representation of actual quantum physics or any other field of science.
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