{"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 lattices?","topic_ref":"c01d47aa6b153914cd3fb1fd6789e159c512020314bd881d4dec988b5de3df86"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"af2c13e6017f6f8840806d775def57b41aa7a925c6cc469e9d983c185087aec9","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"f760a9026ebe5c4dd1df3d08f847c55b455a00237184eb84872ab007415032e8","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"69AaSEKst13fVq0MCq7eIxovtlGvW8Kwoad8IBKZ749XwYKGTt64a-mk6LveECBC6gns2Zv2QA9kZw6TbDquDA"},"schema":"pubphys.envelope/1"},"record_hash":"af2c13e6017f6f8840806d775def57b41aa7a925c6cc469e9d983c185087aec9","leaf_index":440}