Using a clever design of polarization optic, Italian researchers have successfully created four-level 'ququart' quantum states using the polarization and orbital angular momentum of single photons. This approach may help to realize more effective forms of quantum communication.
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Straupe, S., Kulik, S. The quest for higher dimensionality. Nature Photon 4, 585–586 (2010). https://doi.org/10.1038/nphoton.2010.215
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DOI: https://doi.org/10.1038/nphoton.2010.215
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