Spintronic single qubit gate based on a quantum ring with spin-orbit interaction

Details Spintronic single qubit gate based on a quantum ring with spin-orbit interaction Spintronic single qubit gate based on a quantum ring with spin-orbit interaction

2004-06-14

arxiv.org/abs/quant-ph/0406091v1

Phys. Rev. B 71 (3), 033309 (2005).

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.71.033309

In a quantum ring connected with two external leads the spin properties of an incoming electron are modified by the spin-orbit interaction resulting in a transformation of the qubit state carried by the spin. The ring acts as a one qubit spintronic quantum gate whose properties can be varied by tuning the Rashba parameter of the spin-orbit interaction, by changing the relative position of the junctions, as well as by the size of the ring. We show that a large class of unitary transformations can be attained with already one ring -- or a few rings in series -- including the important cases of the Z, X, and Hadamard gates. By choosing appropriate parameters the spin transformations can be made unitary, which corresponds to lossless gates.

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