Informational Mpemba Effect for Fast State Purification in Non-Hermitian System

Quantum Physics [Submitted on 9 Apr 2026] Informational Mpemba Effect for Fast State Purification in Non-Hermitian System C.G.Feyisa, Huan-YuKu, J.-S.You, H.H. Jen Quantum systems are inherently fragile to environmental fluctuations or decoherence, limiting their advantages in applications of quantum information and quantum computation. State purification offers a route to recover the purity of system under noisy conditions. Here, we demonstrate a rapid purification of initially mixed states by harnessing collective reservoir engineering in driven non-Hermitian qubit systems, together with multipartite entanglement generation in larger systems. We show that the onset of efficient purification-assisted entanglement generation is dictated by the degeneracy of collective subradiant modes, rather than by exceptional points. Moreover, the system dynamics manifests an informational Mpemba effect, i.e., a more mixed initial state reaches its steady state with unit purity at a faster rate, resembling the conventional Mpemba effect where a hotter system cools more rapidly. These results reveal a unique advantage of driven non-Hermitian quantum systems with engineered collective dissipation, enabling enhanced purification efficiency and offering new opportunities for quantum engineering. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.07926 [quant-ph]   (or arXiv:2604.07926v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2604.07926 Focus to learn more Submission history From: Chimdessa Gashu Feyisa Mr. [view email] [v1] Thu, 9 Apr 2026 07:47:19 UTC (6,050 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-04 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)