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Neutral atoms in optical lattices have emerged as a leading computing platform, with collisional gates offering a stable mechanism for quantum logic\n                    <jats:sup>1\u201310<\/jats:sup>\n                    . However, previous experiments have treated ultracold collisions as a dynamically fine-tuned process\n                    <jats:sup>11\u201322<\/jats:sup>\n                    , which obscures the underlying quantum geometry and quantum statistics crucial for realizing intrinsically robust operations. Here we propose and experimentally demonstrate a purely geometric two-qubit SWAP gate by transiently populating qubit doublon states of fermionic atoms in a dynamical optical lattice. The presence of these doublon states, together with fermionic exchange anti-symmetry, enables a two-particle quantum holonomy\u2014a geometric evolution in which dynamical phases are absent\n                    <jats:sup>23<\/jats:sup>\n                    . This yields a gate mechanism that is intrinsically protected against fluctuations and inhomogeneities of the confining potentials. The resilience of the gate is further reinforced by time-reversal and chiral symmetries of the Hamiltonian. We experimentally validate this exceptional protection, achieving a loss-corrected amplitude fidelity of 99.91(7)% measured across the entire system consisting of more than 17,000 atom pairs. When combined with recently developed topological pumping methods for atom transport\n                    <jats:sup>16<\/jats:sup>\n                    , our results pave the way for large-scale, highly connected quantum processors. This work introduces a new model for quantum logic that transforms fundamental symmetries, including quantum statistics, into a powerful resource for fault-tolerant computation.\n                  <\/jats:p>","DOI":"10.1038\/s41586-026-10285-1","type":"journal-article","created":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T15:03:24Z","timestamp":1775660604000},"page":"609-614","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Protected quantum gates using qubit doublons in dynamical optical lattices"],"prefix":"10.1038","volume":"652","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1226-038X","authenticated-orcid":false,"given":"Yann","family":"Kiefer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6534-1194","authenticated-orcid":false,"given":"Zijie","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-7096-4946","authenticated-orcid":false,"given":"Lars","family":"Fischer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samuel","family":"Jele","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0663-5720","authenticated-orcid":false,"given":"Marius","family":"G\u00e4chter","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-7326-9883","authenticated-orcid":false,"given":"Giacomo","family":"Bisson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1311-722X","authenticated-orcid":false,"given":"Konrad","family":"Viebahn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8333-107X","authenticated-orcid":false,"given":"Tilman","family":"Esslinger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,4,8]]},"reference":[{"key":"10285_CR1","doi-asserted-by":"publisher","first-page":"1975","DOI":"10.1103\/PhysRevLett.82.1975","volume":"82","author":"D Jaksch","year":"1999","unstructured":"Jaksch, D., Briegel, H.-J., Cirac, J. 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