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Journal Article

Quantum Fisher Information with Coherence

MPS-Authors

Sánchez-Soto,  Luis
Quantumness, Tomography, Entanglement, and Codes, Emeritus Group Leuchs, Emeritus Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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1910.10265.pdf
(Preprint), 197KB

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Citation

Hradil, Z., Řeháček, J., Sánchez-Soto, L., & Englert, B.-G. (2020). Quantum Fisher Information with Coherence. Optica, 6(11), 1437-1440. doi:10.1364/OPTICA.6.001437.


Cite as: https://hdl.handle.net/21.11116/0000-0008-12C1-9
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.