Manipulation of two spin qubits in a double quantum dot using an electric field

Details Manipulation of two spin qubits in a double quantum dot using an electric field Manipulation of two spin qubits in a double quantum dot using an electric field

2010-05-17

arxiv.org/abs/1005.2793v2

Phys. Rev. B 82, 195305 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures

Scientific paper

10.1103/PhysRevB.82.195305

We propose purely electric manipulation of spin qubits by means of the spin-orbit interaction (SOI) {\it without magnetic field or magnets} in a double-quantum dot. All the unitary transformations can be constructed by the time-dependent Dzyaloshinsky-Moriya interaction between the two spins, which arises from the Rashba SOI modulated by electric field. As a few demonstrations, we study both analytically and numerically the three operations, i.e., (A) the spin initialization, (B) the two-spin rotation in the opposite directions, and (C) the two-spin rotation in the same direction. The effects of the relaxation and the feasibility of this proposal are also discussed.

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