Optimal measurements for relative quantum information
量子物理
2007-05-23 v3
摘要
We provide optimal measurement schemes for estimating relative parameters of the quantum state of a pair of spin systems. We prove that the optimal measurements are joint measurements on the pair of systems, meaning that they cannot be achieved by local operations and classical communication. We also demonstrate that in the limit where one of the spins becomes macroscopic, our results reproduce those that are obtained by treating that spin as a classical reference direction.
引用
@article{arxiv.quant-ph/0310009,
title = {Optimal measurements for relative quantum information},
author = {Stephen D. Bartlett and Terry Rudolph and Robert W. Spekkens},
journal= {arXiv preprint arXiv:quant-ph/0310009},
year = {2007}
}
备注
6 pages, 1 figure, published version