Efficient quantum computation within a disordered Heisenberg spin-chain
Quantum Physics
2007-05-23 v3 Materials Science
Abstract
We show that efficient quantum computation is possible using a disordered Heisenberg spin-chain with `always-on' couplings. Such disorder occurs naturally in nanofabricated systems. Considering a simple chain setup, we show that an arbitrary two-qubit gate can be implemented using just three relaxations of a controlled qubit, which amounts to switching the on-site energy terms at most twenty-one times.
Cite
@article{arxiv.quant-ph/0404163,
title = {Efficient quantum computation within a disordered Heisenberg spin-chain},
author = {Chiu Fan Lee and Neil F. Johnson},
journal= {arXiv preprint arXiv:quant-ph/0404163},
year = {2007}
}
Comments
To appear in Phys. Rev. A