Entangled quantum states as direction indicators
Quantum Physics
2009-11-06 v1
Abstract
We consider the use of N spin-1/2 particles for indicating a direction in space. If N>2, their optimal state is entangled. For large N, the mean square error decreases as N^{-2} (rather than N^{-1} for parallel spins).
Cite
@article{arxiv.quant-ph/0010085,
title = {Entangled quantum states as direction indicators},
author = {Asher Peres and Petra F. Scudo},
journal= {arXiv preprint arXiv:quant-ph/0010085},
year = {2009}
}
Comments
3 pages REVTEX and one PostScript figure