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.

中文翻译：

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具有连贯性的Quantum Fisher信息

在用于实现光学超分辨率的最新建议中，量子Fisher信息（QFI）的变体量化了可达到的精度。我们发现，关于由相干效应导致的分辨率的大幅提高的说法令人质疑，因为它们引用的是数据的很小子集，而没有进行适当的归一化处理。当QFI标准化后，考虑到信号强度，相干源比不相干源没有优势。我们的发现与光学仪器可达到的精度的进一步研究息息相关。