Nanotechnology: The fine print

    Nature Nanotechnol. doi:10.1038/nnano.2008.415 (2009)

    The limit for information density seemed to be set: at best, a bit could be stored in the presence, or absence, of an atom or electron. But Chris Moon and his colleagues at Stanford University in California have found a way to store data in subatomic spaces using quantum holograms.

    They stuck carbon monoxide molecules on a thin layer of copper using a scanning tunnelling microscope. A pond of electrons 'illuminated' the arrangement of these gas molecules, and where extra information was stored in the probabilistic shape of an electron's quantum wave, that electron formed part of a hologram. Together, the data-rich electrons formed an 'S' — for Stanford — with a linewidth as small as 0.3 nanometres.

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    Nanotechnology: The fine print. Nature 457, 639 (2009).

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