Charge-to-spin conversion of electron entanglement states and spin-interaction-free solid-state quantum computation

摘要

Without resorting to spin-spin coupling, we propose a scalable spin quantumcomputing scheme assisted with a semiconductor multiple-quantum-dot structure.The techniques of single electron transitions and the nanostructure ofquantum-dot cellular automata (QCA) are used to generate charge entangledstates of two electrons, which are then converted into spin entanglement statesusing single-spin rotations only. Deterministic two-qubit quantum gates arealso manipulated using only single-spin rotations with the help of QCA. Asingle-shot readout of spin states can be carried out by coupling the multipledot structure to a quantum point contact. As a result, deterministicspin-interaction-free quantum computing can be implemented in semiconductornanostructure.