Author

Phi Hung Nguyen

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Preprint Oct 2026

Quantum-Fisher-information-aware optimization yields a quantum reservoir advantage over tuned classical reservoirs

We show that a quantum reservoir computer optimized with its quantum Fisher information (QFI) has a quantum advantage over a classical reservoir of equal readout cost, provided by a quantum-information advantage: optimizing the quantum parameters with the QFI metric. On Mackey-Glass forecasting, a driven Jaynes-Cumming...

Phi Hung Nguyen, D. Soh · 0 citations

Preprint Aug 2026

A Single Atom in Front of a Mirror is a Universal Reservoir Computer

Universal approximation in reservoir computing is typically associated with a class of reservoirs. We show that universality can be associated with a single reservoir, considering a minimal setup of a single atom in front of a mirror. In its linear-transducer limit, our reservoir is a universal approximator of fading-m...

Peter J. Ehlers, Phi Hung Nguyen, Kanu Sinha et al. · 0 citations

Preprint Sep 2026

Operator-language Feynman rules for driven-dissipative quantum systems: from mean field to non-Gaussian photon correlations

We construct Feynman rules for Lindblad master equations in the operator language of quantum optics: a fixed algebra of elementary operator moves and closed-form propagators for perturbation theory about an exactly solvable, in most cases Gaussian, generator. The expansion separates into a kinematic part (the shift alg...

Peter J. Ehlers, Phi Hung Nguyen, D. Soh · 0 citations