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quant-ph2026
Reliable Adaptive Stopping for Krylov-Shadow Quantum Fisher Information Estimation
Erjie Liu, Yangshuai Wang
Scalable quantum Fisher information (QFI) estimation becomes actionable when the numerical estimate is paired with a trustworthy stopping decision. Krylov-shadow QFI estimation has…
quant-ph2026
Symmetry-Protected Basin Localization in Variational Quantum Eigensolvers
Yangshuai Wang
Variational quantum eigensolvers fail before optimization begins when strong correlation splits the molecular energy landscape into competing basins and the initial state selects a…
quant-ph2026
Analysis of Hessian Scaling for Local and Global Costs in Variational Quantum Algorithm
Yihan Huang, Yangshuai Wang
Barren plateaus in variational quantum algorithms are typically described by gradient concentration at random initialization. In contrast, rigorous results for the Hessian, even at…