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Our approach is based on the functional Husimi Q<\/mml:mi><\/mml:math>-distribution and a suitably chosen relative entropy, which we show to be non-trivially bounded from above by the uncertainty principle. The resulting relative entropic uncertainty relation is as general as the concept of coherent states and thus holds for quantum fields of bosonic and fermionic type. Its simple form enables diverse applications, among which we present a complete characterization of the uncertainty surplus of arbitrary states in terms of the total particle number for a scalar field and the fermionic description of the Ising model. Moreover, we provide a quantitative interpretation of the role of the uncertainty principle for quantum phase transitions.<\/jats:p>","DOI":"10.22331\/q-2024-07-17-1414","type":"journal-article","created":{"date-parts":[[2024,7,17]],"date-time":"2024-07-17T14:53:39Z","timestamp":1721228019000},"page":"1414","update-policy":"https:\/\/doi.org\/10.22331\/q-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["Entropic distinguishability of quantum fields in phase space"],"prefix":"10.22331","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-0953-6656","authenticated-orcid":false,"given":"Sara","family":"Ditsch","sequence":"first","affiliation":[{"name":"Physik Department, TUM School of Natural Sciences, Technische Universit\u00e4t M\u00fcnchen, James-Franck-Stra\u00dfe 1, 85748 Garching, Germany"},{"name":"Max-Planck-Institut f\u00fcr Physik, Werner-Heisenberg-Institut, Boltzmannstr. 8, 85748 Garching, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1477-9855","authenticated-orcid":false,"given":"Tobias","family":"Haas","sequence":"additional","affiliation":[{"name":"Centre for Quantum Information and Communication, \u00c9cole polytechnique de Bruxelles, CP 165, Universit\u00e9 libre de Bruxelles, 1050 Brussels, Belgium"}]}],"member":"9598","published-online":{"date-parts":[[2024,7,17]]},"reference":[{"key":"0","doi-asserted-by":"publisher","unstructured":"W. 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