arXiv 1806.080732018-06-21quant-ph

Modular-value-based metrology with spin coherent pointers

Le Bin Ho, Yasushi Kondo

备注：: 6 pages, 3 figures
DOI：: 10.1016/j.physleta.2018.10.041

英文摘要：

Modular values are quantities that described by pre- and postselected states of quantum systems like weak values but are different from them: The associated interaction is not necessary to be weak. We discuss an optimal modular-value-based measurement with a spin coherent pointer: A quantum system is exposed to a field in which strength is to be estimated through its modular value. We consider two cases, with a two-dimensional and a higher-dimensional pointer, and evaluate the quantum Fisher information. The modular-value-based measurement has no merit in the former case, while its sensitivity can be enhanced in the latter case. We also consider the pointer under a phase-flip error. Our study should motivate researchers to apply the modular-value-based measurements for quantum metrology.

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