Quantum gates by coupled asymmetric quantum dots and controlled-NOT-gate operation

Details Quantum gates by coupled asymmetric quantum dots and controlled-NOT-gate operation Quantum gates by coupled asymmetric quantum dots and controlled-NOT-gate operation

1999-02-09

arxiv.org/abs/quant-ph/9902031v2

Phys.Rev.A61:022305,2000

Physics

Quantum Physics

LaTeX, 7 pages, 5 figures, revised content, to appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.61.022305

A quantum computer based on an asymmetric coupled dot system has been proposed and shown to operate as the controlled-NOT-gate. The basic idea is (1) the electron is localized in one of the asymmetric coupled dots. (2)The electron transfer takes place from one dot to the other when the energy-levels of the coupled dots are set close. (3)The Coulomb interaction between the coupled dots mutually affects the energy levels of the other coupled dots. The decoherence time of the quantum computation and the measurement time are estimated. The proposed system can be realized by developing the technology of the single-electron memory using Si nanocrystals and the direct combination of the quantum circuit and the conventional circuit is possible.

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