Controllable anisotropic exchange coupling between spin qubits in quantum dots
Mesoscale and Nanoscale Physics
2013-08-26 v2 Quantum Physics
Abstract
The exchange coupling between quantum dot spin qubits is isotropic, which restricts the types of quantum gates that can be formed. Here, we propose a method for controlling anisotropic interactions between spins arranged in a bus geometry. The symmetry is broken by an external magnetic field, resulting in XXZ-type interactions that can efficiently generate Greenberger-Horne-Zeilinger (GHZ) states or universal gate sets for exchange-only quantum computing. Analysis of the bus ground state provides a link between quantum critical phenomena and the communication capacity.
Cite
@article{arxiv.1012.0565,
title = {Controllable anisotropic exchange coupling between spin qubits in quantum dots},
author = {Yun-Pil Shim and Sangchul Oh and Xuedong Hu and Mark Friesen},
journal= {arXiv preprint arXiv:1012.0565},
year = {2013}
}
Comments
4 pages with 3 figures