Micro-magnets for coherent control of spin-charge qubit in lateral quantum dots

Details Micro-magnets for coherent control of spin-charge qubit in lateral quantum dots Micro-magnets for coherent control of spin-charge qubit in lateral quantum dots

2006-12-13

arxiv.org/abs/cond-mat/0612314v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures. Accepted for publication in App. Phys. Lett

Scientific paper

A lateral quantum dot design for coherent electrical manipulation of a two-level spin-charge system is presented. Two micron-size permanent magnets integrated to high-frequency electrodes produce a static slanting magnetic field suitable for voltage controlled single qubit gate operations. Stray field deviation from the slanting form is taken into account in the Hamiltonian describing the two-level system, which involves hybridization of a single electron spin to the quantum dot's orbitals. Operation speed and gate fidelity are related to device parameters. Sub 100 ns $\pi$ pulse duration can be achieved with lattice fluctuations coherence time of 4 ms for GaAs.

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