Experimental simulation of closed timelike curves.

@article{Ringbauer2014ExperimentalSO,
  title={Experimental simulation of closed timelike curves.},
  author={Martin Ringbauer and Matthew A. Broome and Casey R. Myers and Andrew G. White and Timothy C. Ralph},
  journal={Nature communications},
  year={2014},
  volume={5},
  pages={
          4145
        }
}
Closed timelike curves are among the most controversial features of modern physics. As legitimate solutions to Einstein's field equations, they allow for time travel, which instinctively seems paradoxical. However, in the quantum regime these paradoxes can be resolved, leaving closed timelike curves consistent with relativity. The study of these systems therefore provides valuable insight into nonlinearities and the emergence of causal structures in quantum mechanics--essential for any… 

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