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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">najo-1247</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="en"><subject>PHYSICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА</subject></subj-group></article-categories><title-group><article-title>Microscopic discrete model of nonideal photodetector</article-title><trans-title-group xml:lang="ru"><trans-title>Микроскопическая дискретная модель неидеального фотодетектора</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>Мирошниченко</surname><given-names>Г. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Miroshnichenko</surname><given-names>G. P.</given-names></name></name-alternatives><bio xml:lang="en"><p>G.P. Miroshnichenko – Professor, Doctor of Science</p></bio><email xlink:type="simple">gpmirosh@gmail.com</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>Трифанов</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Trifanov</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>A.I. Trifanov – postgraduate student</p></bio><email xlink:type="simple">alextrifanov@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики<country>Россия</country></aff><aff xml:lang="en">Saint Petersburg National Research University of Information Technologies, Mechanics and Optics<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2012</year></pub-date><pub-date pub-type="epub"><day>20</day><month>08</month><year>2025</year></pub-date><volume>3</volume><issue>1</issue><fpage>93</fpage><lpage>100</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Miroshnichenko G.P., Trifanov A.I., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Мирошниченко Г.П., Трифанов А.И.</copyright-holder><copyright-holder xml:lang="en">Miroshnichenko G.P., Trifanov A.I.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://nanojournal.ifmo.ru/jour/article/view/1247">https://nanojournal.ifmo.ru/jour/article/view/1247</self-uri><abstract><p>The descreet photodetection process is under investigation. It is assumed to be nonideal due to the possibility of appearing "dark" and "bright" clicks of ionization chamber, which measures the atom state. The nonorthogonal POVM measures and Kraus extension on the field states space are proposed.</p></abstract><trans-abstract xml:lang="ru"><p>Исследован процесс дискретного фотодетектирования в предположении о неидеальности детектора атомов- зондов. Предложена неортогональная система операторозначных мер, описывающая процесс измерения и построены трансформеры атомных и полевых состояний.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>фотодетектирование</kwd><kwd>ионизационная камера</kwd><kwd>резонаторное взаимодействие</kwd><kwd>редукция состояния</kwd><kwd>разложение Крауса</kwd></kwd-group><kwd-group xml:lang="en"><kwd>photodetection</kwd><kwd>ionizing chamber</kwd><kwd>QED intracavity interaction</kwd><kwd>state reduction</kwd><kwd>Kraus extension</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Работа поддержана в рамках Аналитической ведомственной целевой программы «Развитие научного потенциала высшей школы» No.2.1.1/9425, Федеральной целевой программой «Научные и научно-педагогические кадры инновационной России» 2009-2013 годы. Государственный контракт No.П689. 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