Abstract
A theoretical description is given of how a prototype quantum computer using a single dot would function. The basic element of a quantum computer is represented by a quantum unit of information, or qubit. The presence and absence of the exciton in a quantum dot constitutes a qubit and the up and down spin excitons in the same dot yield two qubits with a strong mutual interaction. Laser control of these two excitons in a dot has the makings of a two-qubit quantum computer.