Experimental proof of nonlocal wavefunction collapse for a single particle using homodyne measurements.

@article{Fuwa2015ExperimentalPO,
  title={Experimental proof of nonlocal wavefunction collapse for a single particle using homodyne measurements.},
  author={Maria Fuwa and Shuntaro Takeda and Marcin Zwierz and Howard M. Wiseman and Akira Furusawa},
  journal={Nature communications},
  year={2015},
  volume={6},
  pages={
          6665
        }
}
A single quantum particle can be described by a wavefunction that spreads over arbitrarily large distances; however, it is never detected in two (or more) places. This strange phenomenon is explained in the quantum theory by what Einstein repudiated as 'spooky action at a distance': the instantaneous nonlocal collapse of the wavefunction to wherever the particle is detected. Here we demonstrate this single-particle spooky action, with no efficiency loophole, by splitting a single photon between… 
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