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Sponsored Artificial Intelligence: A Modern Approach, Global Edition Artificial Intelligence: A Modern Approach, Global Edition

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Sheng-Shi Pang

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Preprint Sep 2026

Extensibly Causally Separable Processes Admit Realizations as Quantum Circuits with Classical Control of Causal Order

Indefinite causal order extends the conventional circuit paradigm by allowing local quantum operations to be connected without a predetermined global order. Within the process-matrix framework, it is characterized by causal nonseparability, whereas extensible causal separability (ECS) requires that, under arbitrary inp...

Wen-Jie Wei, Sheng-Shi Pang · 0 citations
Preprint Sep 2026

Fundamental Limits of Quantum Metrology Beyond Fixed Causal Order

Quantum metrology with indefinite causal order (ICO) has attracted intense interest due to its potential to surpass the limitations of conventional fixed-order strategies. A key open question is whether ICO can fundamentally enhance asymptotic precision scaling. In this work, we bridge this gap for the estimation of a...

Wen-Jie Wei, Yu-Tong Li, Sheng-Shi Pang · 1 citation

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