We propose simple schemes that can perfectly identify projective measurement apparatus secretly chosen from a finite set. Entanglements are used in these schemes both to make possible the perfect identification and to improve the efficiency significantly. A brief discussion on the problem of how to appropriately define distance measures of measurements is also provided based on the results of identification.
Cite
@article{arxiv.quant-ph/0601090,
title = {Identification and Distance Measures of Measurement Apparatus},
author = {Zhengfeng Ji and Yuan Feng and Runyao Duan and Mingsheng Ying},
journal= {arXiv preprint arXiv:quant-ph/0601090},
year = {2007}
}
Comments
5 pages, RevTeX, 1 figure. Revised version with more examples and a reorganization of the contents