Optimal unambiguous comparison of two unknown squeezed vacua
Quantum Physics
2015-05-20 v2
Abstract
We propose a scheme for unambiguous state comparison (USC) of two unknown squeezed vacuum states of an electromagnetic field. Our setup is based on linear optical elements and photon-number detectors, and achieves optimal USC in an ideal case of unit quantum efficiency. In realistic conditions, i.e., for non-unit quantum efficiency of photodetectors, we evaluate the probability of getting an ambiguous result as well as the reliability of the scheme, thus showing its robustness in comparison to previous proposals.
Keywords
Cite
@article{arxiv.1010.2937,
title = {Optimal unambiguous comparison of two unknown squeezed vacua},
author = {Stefano Olivares and Michal Sedlak and Peter Rapcan and Matteo G. A. Paris and Vladimir Buzek},
journal= {arXiv preprint arXiv:1010.2937},
year = {2015}
}
Comments
7 pages, 4 figures (revised version)