Structural basis of multistationary quantum systems. II. Effective few-particle dynamics

The mutual coupling of electronic multistationary quantum systems realized, e.g., by semiconductor quantum dots is discussed. For local charge-transfer states such coupling can approximately be described in terms of dipole-dipole interactions: the respective renormalized transition frequencies allow for optically controlled conditional switching processes. Two coupled subsystems can in this way perform all the elementary logical operations, including microscopic information transfer. The appropriate architecture for such a quasimolecular computing system is shown to be the distributed computation based on local transition rules. As a simple example a microscopic realization of a one-dimensional one-way cellular automaton with two states per cell and nearest-neighbor coupling is discussed.