Scientists have demonstrated strongly coupled photon states between two distant high-Q photonic crystal cavities connected by a photonic crystal waveguide. Remote dynamic control over the coupled states could aid the development of delay lines, optical buffers and qubit operations in both classical and quantum information processing.
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Gao, J., McMillan, J. & Wong, C. Remote on-chip coupling. Nature Photon 6, 7–8 (2012). https://doi.org/10.1038/nphoton.2011.328
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DOI: https://doi.org/10.1038/nphoton.2011.328