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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">izmertech</journal-id><journal-title-group><journal-title xml:lang="ru">Измерительная техника</journal-title><trans-title-group xml:lang="en"><trans-title>Izmeritel`naya Tekhnika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-1025</issn><issn pub-type="epub">2949-5237</issn><publisher><publisher-name>ФГУП "ВНИИФТРИ"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32446/0368-1025it.2020-4-20-26</article-id><article-id custom-type="elpub" pub-id-type="custom">izmertech-1777</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОПТИКО-ФИЗИЧЕСКИЕ ИЗМЕРЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>OPTICOPHYSICAL MEASUREMENTS</subject></subj-group></article-categories><title-group><article-title>Квантовый томограф для измерения и характеризации квантовых состояний бифотонных источников</article-title><trans-title-group xml:lang="en"><trans-title>Quantum tomograph for measurement and characterization of quantum states of biphoton sources</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Фроловцев</surname><given-names>Д. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Frolovtsev</surname><given-names>D. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Dmitry N. Frolovtsev</p><p>Moscow</p></bio><email xlink:type="simple">frolovtsev@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Магницкий</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Magnitskiy</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Sergey A. Magnitskiy</p><p>Moscow</p></bio><email xlink:type="simple">frolovtsev@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дёмин</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Demin</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Andrey V. Demin</p><p>Moscow</p></bio><email xlink:type="simple">demin@vniiofi.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Международный лазерный центр; Московский государственный университет им. М. В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>International laser center;  M. V. Lomonosov Moscow state university</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Всероссийский научно-исследовательский институт оптико-физических измерений</institution><country>Россия</country></aff><aff xml:lang="en"><institution>The All-Russian Research Institute for Optical and Physical Measurements Federal State</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>29</day><month>06</month><year>2023</year></pub-date><volume>0</volume><issue>4</issue><fpage>20</fpage><lpage>26</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; ФГУП "ВНИИФТРИ", 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">ФГУП "ВНИИФТРИ"</copyright-holder><copyright-holder xml:lang="en">ФГУП "ВНИИФТРИ"</copyright-holder><license xlink:href="https://www.izmt.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://www.izmt.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://www.izmt.ru/jour/article/view/1777">https://www.izmt.ru/jour/article/view/1777</self-uri><abstract><p>В настоящее время актуальна разработка методов и устройств измерения квантовых состояний потоков фотонов. Предложен прототип устройства для характеризации методом квантовой томографии бифотонных источников света на основе спонтанного параметрического рассеяния. Прототип представляет собой экспериментальную реализацию специализированного квантового томографа, который предназначен для измерения квантовых поляризационных состояний излучения, генерируемого бифотонными источниками. Рассмотрен принцип работы устройства для характеризации бифотонных источников света. Описано специально разработанное программное обеспечение, с помощью которого можно определить статистические характеристики измеренного квантового состояния, рассчитать томографическую и наивероятнейшую оценки матрицы плотности и погрешности измерения элементов матрицы плотности, оценить качество квантового состояния бифотонов.</p></abstract><trans-abstract xml:lang="en"><p>The method and prototype of a device for characterizing of biphoton light sources based on spontaneous parametric downconversion by quantum tomography are described. The prototype is an experimental implementation of a specialized quantum tomograph designed to measure the quantum polarization states of radiation generated by biphoton sources. Specially developed software will determine the statistical characteristics of the measured quantum state, calculate the tomographic and likelihood estimations of the density matrix, calculate the measurement errors of the density matrix elements and evaluate the quality of the quantum state of biphotons.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>фотоника</kwd><kwd>квантовые состояния</kwd><kwd>квантовая томография</kwd><kwd>спонтанное параметрическое рассеяние.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>photonics</kwd><kwd>quantum states</kwd><kwd>quantum tomography</kwd><kwd>spontaneous parametric down-conversion</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Магницкий С. А., Фроловцев Д. Н., Агапов Д. П., Дёмин А. В., Крутиков В. Н., Левин Г. Г. Метрология одиночных фотонов для квантовых информационных технологий // Измерительная техника. 2017. № 3. 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