Generating, manipulating and measuring entanglement and mixture with a reconfigurable photonic circuit

@article{Shadbolt2012GeneratingMA,
  title={Generating, manipulating and measuring entanglement and mixture with a reconfigurable photonic circuit},
  author={Peter J. Shadbolt and Maria Rodas Verde and Alberto Peruzzo and Alberto Politi and Anthony Laing and Mirko Lobino and Jonathan C. F. Matthews and Mark G. Thompson and Jeremy Lloyd O'Brien},
  journal={Nature Photonics},
  year={2012},
  volume={6},
  pages={45-49}
}
Researchers demonstrate a reconfigurable integrated quantum photonic circuit. The device comprises a two-qubit entangling gate, several Hadamard-like gates and eight variable phase shifters. The set-up is used to generate entangled states, violate a Bell-type inequality with a continuum of partially entangled states and demonstrate the generation of arbitrary one-qubit mixed states. 
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