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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">matatecs</journal-id><journal-title-group><journal-title xml:lang="ru">Математика и теоретические компьютерные науки</journal-title><trans-title-group xml:lang="en"><trans-title>Mathematics and Theoretical Computer Science</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2949-3919</issn><publisher><publisher-name>Казанский (Приволжский) федеральный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/2949-3919.2026.2.104-117</article-id><article-id custom-type="elpub" pub-id-type="custom">matatecs-112</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>СТАТЬИ</subject></subj-group></article-categories><title-group><article-title>Квантовые каналы, сохраняющие сигма-аддитивность, и измеримые по Уламу кардиналы</article-title><trans-title-group xml:lang="en"><trans-title>Quantum channels preserving sigma-additivity and Ulam measurable cardinals</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>Дженжер</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Dzhenzher</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дженжер Святослав Вадимович,</p><p>Институтский пер., д. 9, г. Долгопрудный, 141701.</p></bio><bio xml:lang="en"><p>Dzhenzher Sviatoslav Vadimovich,</p><p>9, Institutskii per., Dolgoprudny 141701.</p></bio><email xlink:type="simple">sdjenjer@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский физико-технический институт</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Moscow Institute of Physics and Technology</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>29</day><month>07</month><year>2026</year></pub-date><volume>4</volume><issue>2</issue><fpage>104</fpage><lpage>117</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дженжер С.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Дженжер С.В.</copyright-holder><copyright-holder xml:lang="en">Dzhenzher S.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" 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://matatecs.elpub.ru/jour/article/view/112">https://matatecs.elpub.ru/jour/article/view/112</self-uri><abstract><p>Исследуется взаимосвязь между свойствами квантовых состояний в гильбертовом пространстве ℓ2(κ) и теоретико-множественной природой кардинала κ. Основное внимание уделяется вопросу существования сингулярных σ-аддитивных состояний – функционалов, индуцированные меры которых являются σ-аддитивными, но при этом обращаются в нуль на конечных множествах. Хотя известно, что существование таких состояний эквивалентно измеримости κ по Уламу, их структурные и динамические свойства остаются во многом неизученными. Мы доказываем, что любое σ-аддитивное состояние на диагональной алгебре представимо в виде интеграла Петтиса по сингулярной σ-аддитивной мере, что расширяет классическую теорию представлений на ненормальный сектор. Кроме того, мы конструируем класс квантовых каналов, использующих σ-полные ультрафильтры, которые отображают нормальные состояния в сингулярные σ-аддитивные состояния, фактически «архивируя» информацию в сингулярную часть пространства состояний.</p></abstract><trans-abstract xml:lang="en"><p>We study the interplay between the properties of quantum states on the Hilbert space ℓ2(κ) and the set-theoretic nature of the cardinal κ. We focus on the existence of singular σ-additive states – functionals whose induced measures are σ-additive yet vanish on singletons. While the existence of such states is known to be equivalent to the Ulam measurability of κ, their structural and dynamical properties remain largely unexplored. We prove that any σ-additive state on the diagonal algebra is representable as a Pettis integral over a singular σ-additive measure, extending the classical representation theory to the non-normal sector. Furthermore, we construct a class of quantum channels using σ-complete ultrafilters that map normal states to singular σ-additive states, effectively «archiving» information into the singular part of the state space.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>измеримые кардиналы</kwd><kwd>квантовая динамика</kwd><kwd>сингулярные квантовые состояния</kwd><kwd>интеграл Петтиса</kwd></kwd-group><kwd-group xml:lang="en"><kwd>measurable cardinals</kwd><kwd>quantum dynamics</kwd><kwd>singular quantum states</kwd><kwd>Pettis integrals</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">K.Yosida, E.Hewitt, Finitely additive measures, Trans. Amer. Math. Soc. 72 (1), 46–66 (1952). https://doi.org/10.1090/S0002-9947-1952-0045194-X</mixed-citation><mixed-citation xml:lang="en">K.Yosida, E.Hewitt, Finitely additive measures, Trans. Amer. Math. 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