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Quantum resource theories allow for analyzing and bounding conversions that use restricted sets of operations. In the context of continuous-variable systems, state conversions restricted to Gaussian operations are crucial for both fundamental and practical reasons, particularly in state preparation and quantum computing with bosonic codes. However, previous analysis did not consider the relevant case of approximate state conversion. In this work, we introduce a framework for assessing approximate Gaussian state conversion by extending the stellar rank to the approximate stellar rank, which serves as an operational measure of non-Gaussianity. We derive bounds for Gaussian state conversion and distillation under approximate and probabilistic conditions, yielding new no-go results for non-Gaussian state preparation and enabling a reliable assessment of the performance of Gaussian conversion protocols. We also provide an open-source Python library to compute stellar-rank-related quantities and to assess Gaussian conversion.<\/jats:p>","DOI":"10.22331\/q-2026-05-05-2095","type":"journal-article","created":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T11:21:29Z","timestamp":1777980089000},"page":"2095","update-policy":"https:\/\/doi.org\/10.22331\/q-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Assessing non-Gaussian quantum state conversion with the stellar rank"],"prefix":"10.22331","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1677-8696","authenticated-orcid":false,"given":"Oliver","family":"Hahn","sequence":"first","affiliation":[{"name":"Department of Basic Science, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan"},{"name":"Wallenberg Centre for Quantum Technology, Department of Microtechnology and Nanoscience, Chalmers University of Technology, Sweden , SE-412 96 G\u00f6teborg, Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maxime","family":"Garnier","sequence":"additional","affiliation":[{"name":"DIENS, \u00c9cole Normale Sup\u00e9rieure, PSL University, CNRS, INRIA, 45 rue d\u2019Ulm, Paris, 75005, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Giulia","family":"Ferrini","sequence":"additional","affiliation":[{"name":"Wallenberg Centre for Quantum Technology, Department of Microtechnology and Nanoscience, Chalmers University of Technology, Sweden , SE-412 96 G\u00f6teborg, Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alessandro","family":"Ferraro","sequence":"additional","affiliation":[{"name":"Dipartimento di Fisica ``Aldo Pontremoli&apos;&apos;, Universit\u00e0 degli Studi di Milano, I-20133 Milano, Italy"},{"name":"Centre for Theoretical Atomic, Molecular and Optical Physics, Queen&apos;s University Belfast, Belfast BT7 1NN, United Kingdom"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0135-9819","authenticated-orcid":false,"given":"Ulysse","family":"Chabaud","sequence":"additional","affiliation":[{"name":"DIENS, \u00c9cole Normale Sup\u00e9rieure, PSL University, CNRS, INRIA, 45 rue d\u2019Ulm, Paris, 75005, France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"9598","published-online":{"date-parts":[[2026,5,5]]},"reference":[{"key":"0","doi-asserted-by":"publisher","unstructured":"E. 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