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Universal Quantum Logic from Zeeman and Anisotropic Exchange Interactions | | L.-A. Wu
; D.A. Lidar
; | | Date: |
24 Feb 2002 | | Journal: | Phys. Rev. A 66, 062314 (2002) | | Subject: | quant-ph cond-mat | | Affiliation: | University of Toronto | | Abstract: | Some of the most promising proposals for scalable solid-state quantum computing, e.g., those using electron spins in quantum dots or donor electron or nuclear spins in Si, rely on a two-qubit quantum gate that is ideally generated by an isotropic exchange interaction. However, an anisotropic perturbation arising from spin-orbit coupling is inevitably present. Previous studies focused on removing the anisotropy. Here we introduce a new universal set of quantum logic gates that takes advantage of the anisotropic perturbation. The price is a constant but modest factor in additional pulses. The gain is a scheme that is compatible with the naturally available interactions in spin-based solid-state quantum computers. | | Source: | arXiv, quant-ph/0202135 | | Services: | Forum | Review | PDF | Favorites | |
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