ABSTRACT

Device miniaturization with advanced fabrication techniques has revolutionized the semiconductor industry. This, along with the property of intrinsic carrier spin, may ultimately result in a functional unit utilizing quantum mechanical effects at the fundamental device operating limit. Potential platforms to implement quantum information processing has been demonstrated in many systems, including ion traps [1], nuclear magnetic spin resonances [2], microwave resonators [3], and photonic materials [4]. Among these systems, semiconductor quantum dot molecules (QDMs) are excellent candidates due to 3-D confinement, discrete energy levels, optical access, controllable coupling, and the wealth of semiconductor technology and techniques to draw upon. Spins in these QDMs are considered as a candidate to provide quantum bits (qubits) as they can be initialized, manipulated, and measured through established spectroscopic techniques, for example, via recombination of neutral exciton or charged exciton states (neutral or charged electron–hole pairs). QDMs may also help to realize potential next-generation quantum computing schemes [5] through the generation of entangled photon pairs via neutral biexcitons (exciton pair) [6].