Preprint
Sep 2026
Deciding the Attainability of the Multiparameter Quantum Fisher Information is NP-Hard
The quantum Fisher information (QFI) sets a fundamental bound on the attainable precision when estimating multiple parameters simultaneously. Incompatibility among the individually optimal measurements can, in some cases, imply that the precision limit set by the QFI is not attainable. In certain special cases, includi...
Lorcán O. Conlon, Laura Shou, V. Vijendran et al.
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