Spin-bus concept of spin quantum computing

Abstract

We present a spin-bus concept of quantum computing where an electron spin $S=1∕2$ acts as a bus qubit connected to a finite number $N$ of nuclear spins $I=1∕2$ serving as client qubits. Spin-bus clusters are considered as local processing units and may be interconnected with other spin-bus clusters via electron-electron coupling in a scaled up version. Here we lay the ground for the basic functional unit with long qubit registers, provide the theory and experimental verification of correlated qubit states, and demonstrate the Deutsch algorithm. Experiments were performed on a qubyte plus one nuclear spin in a solid state system.