Quantum Fisher information measurement and verification of the quantum Cramér–Rao bound in a solid-state qubit

Abstract The quantum Cramér–Rao bound sets a fundamental limit on the accuracy of unbiased parameter estimation in quantum systems, relating the uncertainty in determining a parameter to the inverse of the quantum Fisher information. We experimentally demonstrate near saturation of the quantum Cramé...

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Autori principali:	Min Yu, Yu Liu, Pengcheng Yang, Musang Gong, Qingyun Cao, Shaoliang Zhang, Haibin Liu, Markus Heyl, Tomoki Ozawa, Nathan Goldman, Jianming Cai
Natura:	Artigo
Lingua:	Inglês
Pubblicazione:	Nature Portfolio 2022-05-01
Serie:	npj Quantum Information
Accesso online:	https://doi.org/10.1038/s41534-022-00547-x
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