2007/10/30 by Xiang Hao, Shiqun Zhu
Computer Science · Physics and Astronomy · #Magnetic properties of thin films #Quantum and electron transport phenomena #Quantum-Dot Cellular Automata #quant-ph
paper · pdf · doi:10.1103/physreva.76.044306
published as Phys. Rev .A 76, 044306(2007) · 4 pages, 1 figure
openalex publication_date 2007/10/30 · arxiv created 2008/03/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The universal quantum computation is obtained when there exists asymmetric anisotropic exchange between electron spins in coupled semiconductor quantum dots. The asymmetric Heisenberg model can be transformed into the isotropic model through the control of two local unitary rotations for the realization of essential quantum gates. The rotations on each qubit are symmetrical and depend on the strength and orientation of asymmetric exchange. The implementation of the axially symmetric local magnetic fields can assist the construction of quantum logic gates in anisotropic coupled quantum dots. This proposal can efficiently use each physical electron spin as a logical qubit in the universal quantum computation.