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Interesting, this was used as a plot device by influential science fiction author Robert A. Heinlein. The book is called Time for the Stars (wrote in 1956) and has the plot of sending one twin into space and keeping the other here on Earth to be used as a sort of ansible. In the book, the twins have a sense of telepathy between them without the inherent delay that radio waves and other forms of communication had.

I haven't read it in at least 10 years but it was still the first thing I thought of when I saw NASA was doing a twin experiment.