Universal Quantum Logic from Zeeman and Anisotropic Exchange Interactions

Details Universal Quantum Logic from Zeeman and Anisotropic Exchange Interactions Universal Quantum Logic from Zeeman and Anisotropic Exchange Interactions

2002-02-24

arxiv.org/abs/quant-ph/0202135v2

Phys. Rev. A 66, 062314 (2002)

Physics

Quantum Physics

5 pages, including 2 figures. This version to be published in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.66.062314

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.

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