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While extensive work has been done that exploits this, the transition from passivity at a single-shot level to the completely passive Gibbs state is technically clear but lacks a good over-arching intuition. Here, we reformulate passivity for quantum systems in purely geometric terms. This description makes the emergence of the Gibbs state from passive states entirely transparent. Beyond clarifying existing results, it also provides novel analysis for non-equilibrium quantum systems. We show that, to every passive state, one can associate a simple convex shape in a <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:mn>2<\/mml:mn><\/mml:math>-dimensional plane, and that the area of this shape measures the degree to which the system deviates from the manifold of equilibrium states. This provides a novel geometric measure of athermality with relations to both ergotropy and <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:mi>\u03b2<\/mml:mi><\/mml:math>--athermality.<\/jats:p>","DOI":"10.22331\/q-2021-03-15-411","type":"journal-article","created":{"date-parts":[[2021,3,15]],"date-time":"2021-03-15T17:20:14Z","timestamp":1615828814000},"page":"411","update-policy":"https:\/\/doi.org\/10.22331\/q-crossmark-policy-page","source":"Crossref","is-referenced-by-count":13,"title":["The geometry of passivity for quantum systems and a novel elementary derivation of the Gibbs state"],"prefix":"10.22331","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2717-4505","authenticated-orcid":false,"given":"Nikolaos","family":"Koukoulekidis","sequence":"first","affiliation":[{"name":"Department of Physics, Imperial College London, London SW7 2AZ, UK"}]},{"given":"Rhea","family":"Alexander","sequence":"additional","affiliation":[{"name":"Department of Physics, Imperial College London, London SW7 2AZ, UK"}]},{"given":"Thomas","family":"Hebdige","sequence":"additional","affiliation":[{"name":"Department of Physics, Imperial College London, London SW7 2AZ, UK"},{"name":"Department of Mathematics, University of York, Heslington, York, YO10 5DD, UK"}]},{"given":"David","family":"Jennings","sequence":"additional","affiliation":[{"name":"Department of Physics, Imperial College London, London SW7 2AZ, UK"},{"name":"School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK"},{"name":"Department of Physics, University of Oxford, Oxford, OX1 3PU, UK"}]}],"member":"9598","published-online":{"date-parts":[[2021,3,15]]},"reference":[{"key":"0","unstructured":"O. 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