Demonstration of conditional quantum phase shift between ions in a solid.

@article{Longdell2004DemonstrationOC,
  title={Demonstration of conditional quantum phase shift between ions in a solid.},
  author={Jevon Longdell and Matthew J. Sellars and Neil B. Manson},
  journal={Physical review letters},
  year={2004},
  volume={93 13},
  pages={
          130503
        }
}
Because of their long coherence times, dopant ions have been considered promising candidates for scalable solid state quantum computing. Here we demonstrate a conditional phase shift between two qubits based on an optical transition of europium ions. The demonstration uses ensembles that have been selected from a randomly doped sample using spectral hole burning techniques. The electron dipole-dipole interaction between the ions that usually causes instantaneous spectral diffusion is used to… 

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