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title = {{Quantum superposition of a single microwave photon in two different 'colour' states}},  journal = {Nat Phys},  }  @article{McKinstrie_2005,  doi = {10.1364/opex.13.009131},  url = {http://dx.doi.org/10.1364/OPEX.13.009131},  year = {2005},  publisher = {The Optical Society},  volume = {13},  number = {22},  pages = {9131},  author = {C. J. McKinstrie and J. D. Harvey and S. Radic and M. G. Raymer},  title = {{Translation of quantum states by four-wave mixing in fibers}},  journal = {Opt. Express},  }