qca

from The Free On-line Dictionary of Computing (8 July 2008)
Quantum-dot Cellular Automata
QCA

   <electronics, computing> (QCA) Quantum logic circuits created
   by orientating pairs of {quantum cells} so that their relative
   positions determine their affect on each other.  This is
   functionally analogous but structurally different from how
   individual {gates} in {integrated circuits} are combined to
   create logical and memory circuitry.

   The advantages of quantum-dot cellular automata over
   conventional circuitry are extremely small size/high density,
   low power requirements, and potentially high processing
   speeds.  Disadvantages (in 2000) are difficulty of fabrication
   and low yield.

   See also: {quantum cell wire}.

   (http://nd.edu/~qcahome/).

   (http://mitre.org/research/nanotech/quantum_dot_cell.html).

   ["Quantum Dot Heterostructures", D. Bimberg, et al, John Wiley
   & Sons Ltd., Dec 1998].

   (2001-07-17)