Quantum wire networks and their application to logic circuits

Abstract

The methods of integrating quantum devices have not yet been established.In this article, we review our recent works on the formation of quantum wire networks by selective molecular beam epitaxy (MBE) and their application to novel "hexagonal binary decision diagram (BDD) quantum integrated circuits".The growth method and conditions for realizing high-density hexagonal quantum wire networks by the selective MBE have been established, and the growth mechanism has been clarified.Thus, the precise control of the wire cross section has become possible, and a hexagon density range of10⁹cm^-2has been achieved.In the new circuit architecture, quantum transport in hexagonal wire networks is controlled by nanometer scale Schottky gates so as to realize circuits with the BDD logic architecture.Its principle, examples of fabricated BDD circuits and data on the power-delay-product (PDP) performance characteristics are presented and discussed.