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Author

Simon K. Yung

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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. · 0 citations
Preprint Sep 2026

Generation of large-amplitude squeezed cat states with near-unity efficiency

The Gottesman-Kitaev-Preskill encoding has emerged as a leading candidate for fault-tolerant quantum computation with continuous variables. For photonic architectures, the major challenge is preparing high-quality resource states, which can be deterministically synthesised from many large-amplitude cat states. Thus far...

Simon K. Yung, M. Winnel, T. Ralph et al. · 0 citations

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