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Here, we report an integrated polarimetry architecture based on a cholesteric liquid crystal (CLC) waveguide polarization splitter (WPS). By leveraging the synergy between the Bragg\u2010selective reflection of patterned CLCs and total\u2010internal\u2010reflection\u2010induced helicity inversion, this approach enables the efficient spatial decoupling and parallel emission of orthogonal circular polarizations within an ultrathin profile. We developed two application\u2010oriented WPS designs: a monolithic architecture optimized for high efficiency (90%) and architectural simplicity, and a cascaded architecture tailored for superior extinction ratios (141\/134) and geometric symmetry. Experimental results show that the monolithic WPS reduces the optical system volume to merely 3.3% of traditional PBS\u2010based setups while achieving a magnetic sensitivity of 13 fT\/Hz\n                    <jats:sup>1\/2<\/jats:sup>\n                    . This sensitivity is on par with traditional bulky polarimetry schemes and surpasses existing state\u2010of\u2010the\u2010art integrated solutions. Furthermore, the CLC\u2010WPS is compatible with established liquid crystal manufacturing processes, offering a scalable and cost\u2010effective fabrication route obviating the need for expensive nanolithography. This work paves the way for mass\u2010producible, high\u2010performance quantum sensors, with broad implications for high\u2010resolution biomagnetic imaging systems.\n                  <\/jats:p>","DOI":"10.1002\/advs.77320","type":"journal-article","created":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T15:43:11Z","timestamp":1787845391000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Efficient Cholesteric Liquid Crystal Waveguide Polarizing Splitters for High\u2010Sensitivity Chip\u2010Scale Atomic Magnetometry"],"prefix":"10.1002","author":[{"given":"Zhibo","family":"Cui","sequence":"first","affiliation":[{"name":"Key Laboratory of Ultra\u2010Weak Magnetic Field Measurement Technology Ministry of Education School of Instrumentation and Optoelectronic Engineering Beihang University  Beijing China"},{"name":"Institute of Large\u2010scale Scientific Facility and Centre for Zero Magnetic Field Science 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National Laboratory  Hefei China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaopu","family":"Hou","sequence":"additional","affiliation":[{"name":"Key Laboratory of Ultra\u2010Weak Magnetic Field Measurement Technology Ministry of Education School of Instrumentation and Optoelectronic Engineering Beihang University  Beijing China"},{"name":"Institute of Large\u2010scale Scientific Facility and Centre for Zero Magnetic Field Science Beihang University  Beijing China"},{"name":"Beihang Hangzhou Innovation Institute  Hangzhou China"},{"name":"Hefei National Laboratory  Hefei China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinsheng","family":"Hu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Ultra\u2010Weak Magnetic Field Measurement Technology Ministry of Education School of Instrumentation and Optoelectronic Engineering Beihang University  Beijing China"},{"name":"Institute of Large\u2010scale Scientific Facility and Centre 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