ABSTRACT
The goal of quantum computation is the reduction of numerical computations as well as communication by language and pictures to manipulations of finite length sequences of the letters 0 and 1 by viewing them as labels of ‘states’ of a number of ‘2-level quantum systems’ and effecting changes of states by the methods of quantum mechanics. Two typical examples of 2-level quantum systems are: (1) the electron with its spin ‘up’ and ‘down’ states; (2) the ammonia molecule NH3 in which the nitrogen atom can be ‘above’ or ‘below’ the plane of the three hydrogen atoms. (See Feynman (1965)).
