Author

Jian Wu

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Preprint Sep 2026

Density and Spectral Criteria for Universal Nonuniform Sampling of Positive Operator Orbits

We characterize locally finite sets \(T\subset[0,\infty)\) that preserve exact observability from nonnegative integer times for every bounded positive operator \(A\) and bounded observation operator \(C\). The Stein identity reduces universality to uniform upper and lower bounds on radial Stein--Pick cones over all fin...

Jian Wu · 1 citation · ⚡1

Preprint Sep 2026

Universal Nonuniform Sampling of Positive Operator Orbits via Complete Stein--Pick Criteria and Density

We study nonuniform sampling for positive operator systems. Given a locally finite set \(T\subset[0,\infty)\), we determine when exact observability of \(\{CA^n\}_{n\in\mathbb N}\) implies exact observability of \(\{CA^t\}_{t\in T}\) for every positive operator \(A\) and every observation operator \(C\). Using the Stei...

Jian Wu · 1 citation · ⚡1

Preprint Sep 2026

Loss-Resilient Quantum Networking with Dicke Entanglement

Multipartite entanglement can endow a quantum network with capabilities unavailable classically, yet their evolution under progressively reduced physical and informational access remains largely unexplored. Here we realize the first eight-photon half-excitation Dicke state, with a fidelity of 0.922(11), and use it to i...

Bo-Wen Wang, Hong-Yu Yang, Jia-Cheng Sun et al. · 0 citations