Author

Lu-Fan Zhang

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Preprint Sep 2026

Breaking the Multiplicative Overhead in Quantum Entropy Estimation

The von Neumann, Tsallis, and R\'enyi entropies are fundamental measures of quantum information. A common estimation strategy multiplies the worst-case costs of spectral transformation and statistical readout, leaving gaps to query lower bounds. We reduce this overhead with multi-level algorithms that use local normali...

Jun-Xiang Huang, Chen-Yang Li, Lu-Fan Zhang et al. · 0 citations

Aug 2026

Non-Hermitian quantum reservoir computing

This work proposes a non-Hermitian QRC in which non-Hermitian dynamics are employed as a tunable resource to significantly enhance the QRC performance, and demonstrates that the non-Hermitian reservoir can be tuned toward the edge of chaos by varying a single parameter that controls the non-Hermitian strength.

Lu-Fan Zhang, Yu-Sen Wu, Yong-Pan Gao et al. · Quantum Science and Technolo... · 0 citations