Photonic phase gate via an exchange of fermionic spin waves in a spin chain.

@article{Gorshkov2010PhotonicPG,
  title={Photonic phase gate via an exchange of fermionic spin waves in a spin chain.},
  author={A. Gorshkov and J. Otterbach and E. Demler and M. Fleischhauer and M. Lukin},
  journal={Physical review letters},
  year={2010},
  volume={105 6},
  pages={
          060502
        }
}
We propose a new protocol for implementing the two-qubit photonic phase gate. In our approach, the π phase is acquired by mapping two single photons into atomic excitations with fermionic character and exchanging their positions. The fermionic excitations are realized as spin waves in a spin chain, while photon storage techniques provide the interface between the photons and the spin waves. Possible imperfections and experimental systems suitable for implementing the gate are discussed. 

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