Entangled photons from quantum-dot-cavity systems under non-Markovian decoherence by pulsed excitation

Quantum Physics [Submitted on 21 Mar 2026] Entangled photons from quantum-dot-cavity systems under non-Markovian decoherence by pulsed excitation Katy Snow, Mauro Paternostro Cascaded emission from the biexciton state of a quantum dot results in polarization entangled photon pairs. However, modelling this system becomes challenging when photon emission is cavity-mediated due to the large Hilbert space and non-Markovian nature of its phonon-induced decoherence. Here, we introduce an algorithm that reduces the computational cost of the numerically exact process tensor method for non-Markovian dynamics simulations when the environmental coupling operator has degenerate eigenvalues, making calculations of the non-Markovian dynamics of large systems feasible. We compute the degree of entanglement of photon pairs generated by pulsed two-photon resonant excitation and find surprisingly good agreement between the numerically exact results and those calculated using the approximate polaron master equation method, permitting an efficient exploration of trends across system parameters. Comments: 7 pages, 5 figures Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.20813 [quant-ph]   (or arXiv:2603.20813v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2603.20813 Focus to learn more Submission history From: Katy Snow [view email] [v1] Sat, 21 Mar 2026 13:16:59 UTC (518 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-03 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?)