Theory of spin qubits in nanostructures

Trauzettel, B. (Dept. of Phys. & Astron., Univ. of Basel, Basel, Switzerland); Borhani, M.; Trif, M.; Loss, D.

Source: Journal of the Physical Society of Japan, v 77, n 3, March 2008, 031012-1-9

ISSN: 0031-9015 CODEN: JUPSAU

Publisher: Physical Society of Japan, Japan

Abstract: We review recent advances on the theory of spin qubits in nanostructures. We focus on four selected topics. First, we show how to form spin qubits in the new and promising material graphene. Afterwards, we discuss spin relaxation and decoherence in quantum dots. In particular, we demonstrate how charge fluctations in the surrounding environment cause spin decay via spin-orbit coupling. We then turn to a brief overview of how one can use electric dipole spin resonance (EDSR) to perform single spin rotations in quantum dots using an oscillating electric field. The final topic we cover is the spin-spin coupling via spin-orbit interaction which is an alternative to the usual spin-spin coupling via the Heisenberg exchange interaction. (77 refs.)

terms:  carbon  -  electric fields  -  Heisenberg model  -  nanostructured materials  -  quantum dots  -  spin-orbit interactions  -  spin-spin coupling