{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e1371d1a2a8d6fc73cfdac735d122cda75b6ba4d3317534b094dd489408d7eef","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"ee7dfcc1727c925e1d44bc702dfecf29cf5506addc65b1ecb3f3e26dfd65c588","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"amo.open-system-atoms.loss-induced-magnetism","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Removing pairs of atoms that occupy the same lattice site leaves the survivors in special spin arrangements. Small double-well experiments saw the magnetic correlations flip sign, and whether this grows into extended magnetic order in a full lattice is open.","posed_since":"","precise":"Two-component fermions in a 2D optical lattice described by the Hubbard model $(t, U)$ plus engineered on-site two-body loss at rate $\\gamma$ (for example by photoassociation). Starting from an antiferromagnetically correlated state, determine the time evolution of the spin correlation function $C(r)$ of the surviving atoms, whether nearest-neighbour correlations reverse sign as predicted for double wells, and whether the reversed correlations extend beyond one lattice spacing, as functions of $\\gamma/t$ and $U/t$. Answer: $C(r, \\mathrm{time})$ measured and reproduced by Lindblad numerics.","problem_ref":null,"references":"","settled_by":"Quantum gas microscope measurements of C(r) in a lossy 2D lattice compared with full Lindblad simulation.","status_note":"Sign reversal of the magnetic correlation was observed in isolated double wells (Honda et al., PRL 130, 063001, 2023); extended lattices are untested.","title":"Do two-body losses create long-range magnetic correlations in Hubbard 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