000480815 001__ 480815 000480815 005__ 20250715175630.0 000480815 0247_ $$2doi$$a10.1103/PhysRevResearch.4.013220 000480815 0247_ $$2datacite_doi$$a10.3204/PUBDB-2022-03988 000480815 0247_ $$2altmetric$$aaltmetric:125225316 000480815 0247_ $$2WOS$$aWOS:000779840100002 000480815 0247_ $$2openalex$$aopenalex:W4289515479 000480815 037__ $$aPUBDB-2022-03988 000480815 041__ $$aEnglish 000480815 082__ $$a530 000480815 1001_ $$0P:(DE-H253)PIP1014386$$aSchulze, Kai Sven$$b0$$eCorresponding author 000480815 245__ $$aTowards perfectly linearly polarized x-rays 000480815 260__ $$aCollege Park, MD$$bAPS$$c2022 000480815 3367_ $$2DRIVER$$aarticle 000480815 3367_ $$2DataCite$$aOutput Types/Journal article 000480815 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1659446082_13472 000480815 3367_ $$2BibTeX$$aARTICLE 000480815 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000480815 3367_ $$00$$2EndNote$$aJournal Article 000480815 520__ $$aIn recent years, high-precision x-ray polarimeters have become a key method for the investigation of fundamental physical questions from solid-state physics to quantum optics. Here, we report on the verification of a polarization purity of better than $8×10^{−11}$ at an x-ray free-electron laser, which implies a suppression of the incoming photons to the noise level in the crossed polarizer setting. 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