Quantum Fisher Information with Coherence
Quantum Physics
2019-11-14 v2 Optics
Abstract
In recent proposals for achieving optical super-resolution, variants of the Quantum Fisher Information (QFI) quantify the attainable precision. We find that claims about a strong enhancement of the resolution resulting from coherence effects are questionable because they refer to very small subsets of the data without proper normalization. When the QFI is normalized, accounting for the strength of the signal, there is no advantage of coherent sources over incoherent ones. Our findings have a bearing on further studies of the achievable precision of optical instruments.
Cite
@article{arxiv.1910.10265,
title = {Quantum Fisher Information with Coherence},
author = {Zdeněk Hradil and Jaroslav Řeháček and Luis Sánchez-Soto and Berthold-Georg Englert},
journal= {arXiv preprint arXiv:1910.10265},
year = {2019}
}
Comments
4 pages, 2 figures; v2 with new Abstract and few minor edits