Compact system development of efficient quantum-entangled photon sources towards deployable and industrial devices

Quantum Physics [Submitted on 2 Apr 2026] Compact system development of efficient quantum-entangled photon sources towards deployable and industrial devices Yared G. Zena, Moritz Langer, Ahmad Rahimi, Abhishikth Dhurjati, Pavel Ruchka, Sara Jakovljevic, Mandira Pal, Frank H. P. Fitzek, Harald Giessen, Juergen Czarske, Riccardo Bassoli, Caspar Hopfmann Entangled photon pair sources are a key enabling technology for quantum communication and networking, yet their deployment beyond laboratory environments is hindered by system-level complexity, limited operational stability, and insufficient industry compatibility. Here, we demonstrate a rack-based, mobile quantum light source architecture based on a semiconductor quantum dot emitter that directly addresses these challenges through modular system integration and automated operation. The source generates polarization-entangled photon pairs with an entanglement negativity 2n of up to 0.98(1), confirming near-maximal entanglement quality. In continuous, hands-off operation over a six-hour time window, the system achieves an average single-photon emission rate of 697(8) kHz and a maximum rate of 740(7) kHz, while maintaining 2n-value of more than 95 \%. These results are enabled by the integration of optical excitation, collection, cryogenic operation, and control electronics within a standardized rack footprint, together with automated monitoring. By demonstrating simultaneously high entanglement quality, sustained brightness, and long-term operational stability in an industry-aligned system architecture, this work advances semiconductor quantum dot sources toward deployable entangled photon sources for applied quantum photonics. Comments: 22 Pages, 10 figures Subjects: Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Cite as: arXiv:2604.02024 [quant-ph]   (or arXiv:2604.02024v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2604.02024 Focus to learn more Submission history From: Caspar Hopfmann [view email] [v1] Thu, 2 Apr 2026 13:32:08 UTC (6,948 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-04 Change to browse by: cond-mat cond-mat.mes-hall 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?)