Author

Xiao-Song Li

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Preprint Aug 2026

Relativistic Dirac-Coulomb-Breit Four-Component Multireference Perturbation Theory within the Small Tensor Product Distributed Active Space Framework

We present a four-component multireference second-order perturbation theory (4C-MRPT2) within the small tensor product distributed active space (STP-DAS) framework. The formulation is compatible with the Dirac-Coulomb (DC), Dirac-Coulomb-Gaunt (DCG), and Dirac-Coulomb-Breit (DCB) Hamiltonians, and inherits the memory-e...

R. Majumder, Shiv Upadhyay, Ryan A. Beck et al. · 0 citations

Preprint Aug 2026

A Theory of Finite-Noise Optima and Generalization in Quantum Machine Learning

Quantum noise is expected to degrade quantum machine learning by driving circuits away from their noiseless implementations. Yet recent studies show moderate noise can reduce testing error, a behavior unexplained by weak-noise perturbative error accumulation or strong-noise trainability collapse. Here we develop a stat...

Zi-Yu Zhang, Zikang Jia, Xiao-Song Li et al. · 1 citation