Experimental realization of multipartite entanglement of 60 modes of a quantum optical frequency comb.

@article{Chen2014ExperimentalRO,
  title={Experimental realization of multipartite entanglement of 60 modes of a quantum optical frequency comb.},
  author={Moran Chen and Nicolas C. Menicucci and Olivier Pfister},
  journal={Physical review letters},
  year={2014},
  volume={112 12},
  pages={
          120505
        }
}
We report the experimental realization and characterization of one 60-mode copy and of two 30-mode copies of a dual-rail quantum-wire cluster state in the quantum optical frequency comb of a bimodally pumped optical parametric oscillator. This is the largest entangled system ever created whose subsystems are all available simultaneously. The entanglement proceeds from the coherent concatenation of a multitude of Einstein, Podolsky, and Rosen pairs by a single beam splitter, a procedure which is… 

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