Experimental joint weak measurement on a photon pair as a probe of Hardy's paradox.

@article{Lundeen2009ExperimentalJW,
  title={Experimental joint weak measurement on a photon pair as a probe of Hardy's paradox.},
  author={Jeff S Lundeen and Adam M. Steinberg},
  journal={Physical review letters},
  year={2009},
  volume={102 2},
  pages={
          020404
        }
}
It has been proposed that the ability to perform joint weak measurements on postselected systems would allow us to study quantum paradoxes. These measurements can investigate the history of those particles that contribute to the paradoxical outcome. Here we experimentally perform weak measurements of joint (i.e., nonlocal) observables. In an implementation of Hardy's paradox, we weakly measure the locations of two photons, the subject of the conflicting statements behind the paradox. Remarkably… 

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