The power of reduced quantum states
Quantum Physics
2007-05-23 v1
Abstract
In a system of n quantum particles, we define a measure of the degree of irreducible n-way correlation, by which we mean the correlation that cannot be accounted for by looking at the states of (n-1) particles. In the case of almost all pure states of three qubits we show that there is no such correlation: almost every pure state of three qubits is completely determined by its two-particle reduced density matrices.
Cite
@article{arxiv.quant-ph/0207109,
title = {The power of reduced quantum states},
author = {N. Linden and S. Popescu and W. K. Wootters},
journal= {arXiv preprint arXiv:quant-ph/0207109},
year = {2007}
}