Maximum stabilizer dimension for nonproduct states
Abstract
Composite quantum states can be classified by how they behave under local unitary transformations. Each quantum state has a stabilizer subgroup and a corresponding Lie algebra, the structure of which is a local unitary invariant. In this paper, we study the structure of the stabilizer subalgebra for n-qubit pure states, and find its maximum dimension to be n-1 for nonproduct states of three qubits and higher. The n-qubit Greenberger-Horne-Zeilinger state has a stabilizer subalgebra that achieves the maximum possible dimension for pure nonproduct states. The converse, however, is not true: we show examples of pure 4-qubit states that achieve the maximum nonproduct stabilizer dimension, but have stabilizer subalgebra structures different from that of the n-qubit GHZ state.
Keywords
Cite
@article{arxiv.0706.1785,
title = {Maximum stabilizer dimension for nonproduct states},
author = {Scott N. Walck and David W. Lyons},
journal= {arXiv preprint arXiv:0706.1785},
year = {2008}
}