or whatever that means

“The quantization of conductance on the sensor side was achieved by having the current flow through a constriction that tapers down to the size of a single atom (see figure at http://www.aip.org/png), a passage which imposes quantum
conditions. According to Nebraska scientist Andrei Sokolov (asokol@unlserve.unl.edu), an atom-sized point contact makes the read-write process ever more compact in physical extent, allowing much greater data storage.” (Sokolov et al., Nature Nanotechnology, March 2007)


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