Expanding the principle of local distinguishability
Abstract
The principle of local distinguishability states that an arbitrary physical state of a bipartite system can be determined by the combined statistics of local measurements performed on the subsystems. A necessary and sufficient requirement for the local measurements is that each one must be able to distinguish between all pairs of states of the respective subsystems. We show that if the task is changed into the determination of an arbitrary bipartite pure state, then at least in certain cases it is possible to restrict to local measurements which can distintinguish all pure states but not all states. This surprising fact gives evidence that the principle of local distinguishability may be expanded beyond its usual applicability.
Keywords
Cite
@article{arxiv.1411.0828,
title = {Expanding the principle of local distinguishability},
author = {Claudio Carmeli and Teiko Heinosaari and Jussi Schultz and Alessandro Toigo},
journal= {arXiv preprint arXiv:1411.0828},
year = {2015}
}
Comments
6 pages, 1 figure, new results in v2