Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-09-28
Phys. Rev. B76, 165311 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures, the revised version of quant-ph/0502002 for publication in Phys. Rev. B (to be appear on the issue of Oct.
Scientific paper
10.1103/PhysRevB.76.165311
Without resorting to spin-spin coupling, we propose a scalable spin quantum computing scheme assisted with a semiconductor multiple-quantum-dot structure. The techniques of single electron transitions and the nanostructure of quantum-dot cellular automata (QCA) are used to generate charge entangled states of two electrons, which are then converted into spin entanglement states using single-spin rotations only. Deterministic two-qubit quantum gates are also manipulated using only single-spin rotations with the help of QCA. A single-shot readout of spin states can be carried out by coupling the multiple dot structure to a quantum point contact. As a result, deterministic spin-interaction-free quantum computing can be implemented in semiconductor nanostructure.
Feng Mang
Soo Chopin
Wu Yin-Zhong
Zhang Wei-Min
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