We present a method for encoding and transporting qubits within a dimerized Heisenberg spin-1/2 chain. Logical qubits are localized at the domain walls that separate the two possible dimerized states. The domain walls can be moved to produce "flying spin qubits". The topological nature of these states makes them stable against a wide class of perturbations. Pairs of domain walls can be used to generate Einstein-Podolsky-Rosen pairs of entangled qubits. We discuss speed limitations within an exactly solvable three-spin model and describe a possible physical realization using quantum dot arrays.
@article{arxiv.quant-ph/0606089,
title = {Flying Spin Qubits},
author = {Vanita Srinivasa and Jeremy Levy and C. Stephen Hellberg},
journal= {arXiv preprint arXiv:quant-ph/0606089},
year = {2007}
}
Comments
13 pages, 4 figures. Revised manuscript in response to reviewer comments