Information can be encoded in electron waves on a surface using electronic holograms constructed from single molecules. The information is stored in two spatial dimensions and one energy dimension, and is read with a scanning tunnelling microscope.
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Heller, E. Quantum holography for real. Nature Nanotech 4, 141–142 (2009). https://doi.org/10.1038/nnano.2009.30
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DOI: https://doi.org/10.1038/nnano.2009.30
