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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="review-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Photonics Russia</journal-id><journal-title-group><journal-title xml:lang="en">Photonics Russia</journal-title><trans-title-group xml:lang="ru"><trans-title>Фотоника</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1993-7296</issn><issn publication-format="electronic">2686-844X</issn><publisher><publisher-name xml:lang="en">Technosphera JSC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">682917</article-id><article-id pub-id-type="doi">10.22184/1993-7296.FRos.2025.19.3.232.246</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Quantum Technologies</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Квантовые технологии</subject></subj-group><subj-group subj-group-type="article-type"><subject>Review Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Single Photon Sources. Review Part 4</article-title><trans-title-group xml:lang="ru"><trans-title>Источники одиночных фотонов. Обзор Часть 4</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6063-2657</contrib-id><name-alternatives><name xml:lang="en"><surname>Krishtop</surname><given-names>Vladimir G.</given-names></name><name xml:lang="ru"><surname>Криштоп</surname><given-names>Владимир Григорьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. of Sciences (Phys.&amp;Math.)</p></bio><bio xml:lang="ru"><p>к.ф.-м.н.</p></bio><email>vladimir.krishtop@infotecs.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">JSC “InfoTeСS”</institution></aff><aff><institution xml:lang="ru">АО «ИнфоТеКС»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Moscow Institute of Physics and Technology (MIPT)</institution></aff><aff><institution xml:lang="ru">Московский физико-технический институт (МФТИ)</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Institute of Microelectronics Technology and High Purity Materials RAS</institution></aff><aff><institution xml:lang="ru">Институт проблем технологии микроэлектроники РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-06-05" publication-format="electronic"><day>05</day><month>06</month><year>2025</year></pub-date><volume>19</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru">180-246</issue-title><fpage>232</fpage><lpage>246</lpage><history><date date-type="received" iso-8601-date="2025-06-04"><day>04</day><month>06</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-04"><day>04</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Krishtop V.G.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Криштоп В.Г.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Krishtop V.G.</copyright-holder><copyright-holder xml:lang="ru">Криштоп В.Г.</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/1993-7296/article/view/682917">https://journals.eco-vector.com/1993-7296/article/view/682917</self-uri><abstract xml:lang="en"><p>This review discusses various development methods for the single-photon sources (SPS).Earlier, the first part of the review (Photonics Russia. 2024; 18(5): 376–396) has discussed the requirements for single-photon sources and their characteristic criteria, and described the single-photon sources based on the single ions and single atoms. The second part of the review (Photonics Russia. 2024; 18(8): 610–620) has considered the SPSs based on the quantum dots and on the color centers in crystals. The third part (Photonics Russia. 2025; 19(1): 28–38) has considered the single-photon sources based on the carbon nanotubes and defects in them (defect engineering in nanotubes), on the nanocrystals and layered nanocrystals. The final section examines the single-photon sources on the collective states in the ensemble systems, on the single molecules and metal ions in a polymer matrix, as well as the sources on nonlinear crystals.</p></abstract><trans-abstract xml:lang="ru"><p>В данном обзоре рассматриваются различные способы создания однофотонных источников (ИОФ). Ранее в первой части обзора (Photonics Russia. 2024; 18(5): 376–396) обсуждались требования к однофотонным источникам и критерии их характеризации, описывались источники одиночных фотонов на основе одиночных ионов и на основе одиночных атомов. Во второй части обзора (Photonics Russia. 2024; 18(8): 610–620) были рассмотрены ИОФ на квантовых точках и на центрах окраски в кристаллах. В третьей части (Photonics Russia. 2025; 19(1): 28–38) рассмотрены однофотонные источники на углеродных нанотрубках и дефектах в них (инженерия дефектов в нанотрубках), на нанокристаллах и слоистых нанокристаллах. В заключительной части рассмотрены однофотонные источники на коллективных состояниях в ансамблевых системах, на одиночных молекулах и ионах металлов в полимерной матрице, а также источники на нелинейных кристаллах.</p></trans-abstract><kwd-group xml:lang="en"><kwd>single-photon source (SPS)</kwd><kwd>Ensemble systems</kwd><kwd>Ensemble sources</kwd><kwd>Single molecules</kwd><kwd>four-wave mixing (FWM)</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>однофотонные источники</kwd><kwd>ансамблевые системы</kwd><kwd>ансамблевые источники</kwd><kwd>одиночные молекулы</kwd><kwd>четырехволновое смешение</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>М. К. Есеев, И. Н. Мешков. Ловушки для накопления заряженных частиц и античастиц в прецизионных экспериментах. Успехи физических наук, 2016, Т. 186, № 3, cc. 321–335. https://doi.org/10.3367/UFNr.0186.201603f.0321 M. K. Eseev, I. N. Meshkov. 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