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While integrating these materials into fiber\u2010optic platforms offers unprecedented functionalities in quantum systems, realizing telecom\u2010band in\u2010line photon\u2010pair sources based on highly nonlinear vdW materials remains challenging. Here, we report photon\u2010pair generation centered at telecom wavelength via spontaneous parametric down\u2010conversion in a fiber\u2010integrated device incorporating a ferroelectric vdW crystal, SnP\n                    <jats:sub>2<\/jats:sub>\n                    S\n                    <jats:sub>6<\/jats:sub>\n                    . Benefiting from its giant optical nonlinearity and relaxed phase\u2010matching across near\u2010visible to telecom\u2010band wavelengths, a remarkable nonlinear conversion efficiency of 0.07% is achieved in a few\u2010micrometer\u2010thick SnP\n                    <jats:sub>2<\/jats:sub>\n                    S\n                    <jats:sub>6<\/jats:sub>\n                    film. Moreover, the fiber\u2010integrated SnP\n                    <jats:sub>2<\/jats:sub>\n                    S\n                    <jats:sub>6<\/jats:sub>\n                    device delivers high\u2010quality photon pairs at telecom wavelengths, achieving a detected coincidence rate of 102 counts\/s. The coincidence\u2010to\u2010accidental ratio reached up to 55\u00a0662, which is much larger than that of previous vdW\u2010material\u2010based sources. Furthermore, the device generates polarization\u2010entangled photon pairs, which are verified via quantum state tomography to exhibit fidelities of 0.97 and concurrences of 0.95. This demonstration establishes a scalable, robust fiber\u2010integrated platform that combines the versatility of vdW materials, paving the way toward low\u2010loss, functionalized quantum photonic systems for networking, sensing, and computing.\n                  <\/jats:p>","DOI":"10.1002\/advs.76712","type":"journal-article","created":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T19:40:52Z","timestamp":1784317252000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Efficient Polarization\u2010Entangled Photon\u2010Pair Generation by a Fiber\u2010In\u2010Line van der Waals Material"],"prefix":"10.1002","volume":"13","author":[{"given":"Jungseok","family":"Choi","sequence":"first","affiliation":[{"name":"Department of Energy Systems Research Ajou University  Suwon Gyeonggi\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seongju","family":"Ha","sequence":"additional","affiliation":[{"name":"Korea Research Institute of Standards and Science (KRISS)  Daejeon Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seungjae","family":"Lim","sequence":"additional","affiliation":[{"name":"Department of Energy Systems Research Ajou University  Suwon Gyeonggi\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joohyeon","family":"Ahn","sequence":"additional","affiliation":[{"name":"Department of Energy Systems Research Ajou University  Suwon Gyeonggi\u2010do Republic of Korea"},{"name":"Department of Chemistry Ajou University  Suwon Gyeonggi\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaekyoung","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Energy Systems Research Ajou University  Suwon Gyeonggi\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jong Hyuk","family":"Yim","sequence":"additional","affiliation":[{"name":"Department of Energy Systems Research Ajou University  Suwon Gyeonggi\u2010do Republic of Korea"},{"name":"Department of Physics Ajou University  Suwon Gyeonggi\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nam Hun","family":"Park","sequence":"additional","affiliation":[{"name":"Korea Research Institute of Standards and Science (KRISS)  Daejeon Republic of Korea"},{"name":"Agency for Defense Development (ADD)  Daejeon Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2916-2738","authenticated-orcid":false,"given":"Youngdong","family":"Yoo","sequence":"additional","affiliation":[{"name":"Department of Chemistry Ajou University  Suwon Gyeonggi\u2010do Republic of 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