PRACTICAL ISSUES IN THE REALIZATION OF QUANTUM-DOT CELLULAR-AUTOMATA

Several practical issues in the development and operation of quantum-d ot cellular automata (QCA) cells and systems are discussed. The need f or adiabatic clocking of QCA systems and modeling of electrostatic con finement of quantum dots are presented. Experimental data on dot coupl ing and applications to QCA detectors in a 2-dimensional electron gas (2DEG) are presented. We report a charge detection scheme where we obs erve strong modulation in the detector signal, in addition to the dete ctor exhibiting minimal effect on the dot being measured. With this in vestigation, we demonstrate these two key components required for QCA in AlGaAs/GaAs materials, namely dot coupling and charge-state detecti on. (C) 1996 Academic Press Limited