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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="research-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">634532</article-id><article-id pub-id-type="doi">10.22184/1993-7296.FRos.2024.18.4.282.294</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>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Influence of quantum state fidelity of a single photon source on the bit error rate in quantum key distribution</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние точности квантового состояния поляризации одиночных фотонов на величину битовой ошибки квантового распределения ключа</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Frolovtsev</surname><given-names>D. N.</given-names></name><name xml:lang="ru"><surname>Фроловцев</surname><given-names>Д. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Researcher, Faculty of Physics</p></bio><bio xml:lang="ru"><p>научный сотрудник, Физический факультет</p></bio><email>photonics@technosphera.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Demin</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Демин</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. of Technical Sciences, Researcher</p></bio><bio xml:lang="ru"><p>к. т. н., с.н.с.</p></bio><email>photonics@technosphera.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">МГУ им. М. В. Ломоносова</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">All-Russian Research Institute of Optical and Physical Measurements (VNIIOFI)</institution></aff><aff><institution xml:lang="ru">Всероссийский научно-исследовательский институт оптико-физических измерений (ФГБУ «ВНИИОФИ»)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-07-23" publication-format="electronic"><day>23</day><month>07</month><year>2024</year></pub-date><volume>18</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>282</fpage><lpage>294</lpage><history><date date-type="received" iso-8601-date="2024-07-23"><day>23</day><month>07</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-07-23"><day>23</day><month>07</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Frolovtsev D.N., Demin A.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Фроловцев Д.Н., Демин А.В.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Frolovtsev D.N., Demin A.V.</copyright-holder><copyright-holder xml:lang="ru">Фроловцев Д.Н., Демин А.В.</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/1993-7296/article/view/634532">https://journals.eco-vector.com/1993-7296/article/view/634532</self-uri><abstract xml:lang="en"><p>The paper analyzes the efficiency of a quantum state fidelity to assess the raw bit error value introduced by the polarization state of a single photon source. The analysis was performed for the quantum key distribution schemes BB84 and BBM92. It has been shown theoretically and experimentally that when the fidelity is decreased from 1 to 0 in the BB84 scheme, the raw bit error value linearly increases from 0 to 1, and in the BBM92 scheme – from 0 to 1/2. The experimental setups for determine the influence of fidelity on the bit error value are described in detail.</p></abstract><trans-abstract xml:lang="ru"><p>В работе анализируется эффективность меры качества квантового состояния (фиделити) для оценки величины сырой битовой ошибки, вносимой состоянием поляризации источника одиночных фотонов. Анализ проведен для протоколов квантового распределения ключа ВВ84 и ВВМ92. Теоретически и экспериментально показано, что при уменьшении фиделити от 1 до 0 в протоколе BB84 величина сырой битовой ошибки линейно возрастает от 0 до 1, а в протоколе BBM92 – от 0 до 1 / 2. Подробно описаны экспериментальные установки для исследования влияния фиделити на величину битовой ошибки.</p></trans-abstract><kwd-group xml:lang="en"><kwd>quantum state metrology</kwd><kwd>fidelity</kwd><kwd>quantum key distribution</kwd><kwd>spontaneous parametric light scattering</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>метрология квантовых состояний</kwd><kwd>фиделити</kwd><kwd>квантовое распределение ключа</kwd><kwd>спонтанное параметрическое рассеяние света</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The paper has been prepared with the financial support in the form of a grant from the Russian Science Foundation, unique RSF project number No. 21-12-00155.</funding-statement><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке гранта Российского научного фонда, уникальный номер проекта РНФ № 21-12-00155.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Vaughan O. 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