P-divisibility conditions on subsystems in quantum dynamics
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2025
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| author | Mukhopadhyay, Anumita Ghosh, Praggnyamita Roy, Shibdas |
| author_facet | Mukhopadhyay, Anumita Ghosh, Praggnyamita Roy, Shibdas |
| contents | We investigate the constraints imposed by global unitary dynamics on the P-divisibility of local subsystems in a bipartite system-environment setting. Using the trace distance as a measure of state distinguishability and exploiting its conservation under unitary evolution, we develop a fully symmetric framework that simultaneously tracks information flow in both the open system $S$ and its environment $E$. We first show that for initially uncorrelated states the maximum net non-Markovian gain in one subsystem is rigidly bounded by the initial distinguishability of the other (Theorem~1). We then establish a two-sided Correlation Window (Theorem~2) that confines the sum of net changes in local distinguishability: the upper edge is set by the total initial marginal distinguishability, while the lower edge is governed exactly by the dynamically generated bipartite correlation norm, proving that any mutual loss of local distinguishability is necessarily encoded into correlations. Finally, we generalize both results to initially correlated states (Theorem~3), showing that initial bipartite correlations augment the capacity for non-Markovian gain and that simultaneous P-indivisibility of both subsystems is funded by the degradation of the initial correlation reservoir. These results are validated on four-qubit GHZ and W circuit examples, demonstrating subsystem locking, asymmetric single-subsystem backflow, and correlation-funded simultaneous back-flow. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_07188 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | P-divisibility conditions on subsystems in quantum dynamics Mukhopadhyay, Anumita Ghosh, Praggnyamita Roy, Shibdas Quantum Physics We investigate the constraints imposed by global unitary dynamics on the P-divisibility of local subsystems in a bipartite system-environment setting. Using the trace distance as a measure of state distinguishability and exploiting its conservation under unitary evolution, we develop a fully symmetric framework that simultaneously tracks information flow in both the open system $S$ and its environment $E$. We first show that for initially uncorrelated states the maximum net non-Markovian gain in one subsystem is rigidly bounded by the initial distinguishability of the other (Theorem~1). We then establish a two-sided Correlation Window (Theorem~2) that confines the sum of net changes in local distinguishability: the upper edge is set by the total initial marginal distinguishability, while the lower edge is governed exactly by the dynamically generated bipartite correlation norm, proving that any mutual loss of local distinguishability is necessarily encoded into correlations. Finally, we generalize both results to initially correlated states (Theorem~3), showing that initial bipartite correlations augment the capacity for non-Markovian gain and that simultaneous P-indivisibility of both subsystems is funded by the degradation of the initial correlation reservoir. These results are validated on four-qubit GHZ and W circuit examples, demonstrating subsystem locking, asymmetric single-subsystem backflow, and correlation-funded simultaneous back-flow. |
| title | P-divisibility conditions on subsystems in quantum dynamics |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2508.07188 |