Quantum holographic encoding in a two-dimensional electron gas
- 25 January 2009
- journal article
- Published by Springer Science and Business Media LLC in Nature Nanotechnology
- Vol. 4 (3), 167-172
- https://doi.org/10.1038/nnano.2008.415
Abstract
The ability of the scanning tunnelling microscope to manipulate single atoms and molecules has allowed a single bit of information to be represented by a single atom or molecule. Although such information densities remain far beyond the reach of real-world devices, it has been assumed that the finite spacing between atoms in condensed-matter systems sets a rigid upper limit on information density. Here, we show that it is possible to exceed this limit with a holographic method that is based on electron wavefunctions rather than free-space optical waves. Scanning tunnelling microscopy and holograms comprised of individually manipulated molecules are used to create and detect electronically projected objects with features as small as ∼0.3 nm, and to achieve information densities in excess of 20 bits nm−2. Our electronic quantum encoding scheme involves placing tens of bits of information into a single fermionic state.Keywords
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