Universal quantum dynamics from two 2-local Hamiltonians
Quantum Physics
2008-01-30 v1
Abstract
In this paper, we show that the ability to switch globally between two 2-local Hamiltonians on n qubits is sufficient for achieving universal unitary dynamics on those n qubits. Of the two Hamiltonians used in the construction, one is comprised of nearest-neighbour two-qubit interactions on a one-dimensional chain, the other is comprised of single-qubit interactions. We describe a scheme for choosing the switching times in order to generate arbitrary one- and two-qubit gates on the n qubits. However the switching scheme is inefficient, and we leave as an open problem the question of whether the universality of the Hamiltonians can be exploited in an efficient way.
Cite
@article{arxiv.0801.4487,
title = {Universal quantum dynamics from two 2-local Hamiltonians},
author = {Charles D. Hill and Henry L. Haselgrove},
journal= {arXiv preprint arXiv:0801.4487},
year = {2008}
}