Anisotropic Spin Exchange in Pulsed Quantum Gates

Details Anisotropic Spin Exchange in Pulsed Quantum Gates Anisotropic Spin Exchange in Pulsed Quantum Gates

2001-06-28

arxiv.org/abs/quant-ph/0106161v1

Phys. Rev. Lett. 87, 207901 (2001)

Physics

Quantum Physics

4 pages, 1 eps figure

Scientific paper

10.1103/PhysRevLett.87.207901

We show how to eliminate the first-order effects of the spin-orbit interaction in the performance of a two-qubit quantum gate. Our procedure involves tailoring the time dependence of the coupling between neighboring spins. We derive an effective Hamiltonian which permits a systematic analysis of this tailoring. Time-symmetric pulsing of the coupling automatically eliminates several undesirable terms in this Hamiltonian. Well chosen pulse shapes can produce an effectively isotropic exchange gate, which can be used in universal quantum computation with appropriate coding.

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