{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"71d3020b2f0c214e089ce872b9c3b545939e61033c335b22b016f6fbe7be14c3","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"6036e4d47416defc96bffce0d0d7991d626c7a1816c160b19c27d26310ad9bdf","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"amo.rydberg-arrays.ruby-spin-liquid","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"A 2021 experiment saw signs of a quantum spin liquid, a state with hidden long-range quantum entanglement, in atoms on a ruby-shaped lattice. It is unclear whether this was a true lowest-energy state or a product of fast driving.","posed_since":"2021","precise":"$H = \\sum_i (\\Omega/2) X_i - \\Delta n_i + \\sum_{ij} V_{ij} n_i n_j$ with $V_{ij} = C_6/r_{ij}^6$ on the ruby lattice. Determine whether the ground state at some $(\\Delta/\\Omega, R_b/a)$ has $Z2$ topological order, diagnosed by topological entanglement entropy $\\gamma = \\ln 2$ or anyon braiding, with the full $1/r^6$ tails kept. Answer: yes or no with the parameter window.","problem_ref":null,"references":"","settled_by":"Large-cylinder DMRG or tensor-network calculations with the full interaction showing $\\gamma = \\ln 2$, matched by an adiabatic preparation that measures anyon statistics.","status_note":"Quantum Monte Carlo finds a renormalized classical spin liquid at $T/\\Omega = 0.01 \\text{ to } 0.5$ in the ruby PXP model, with a shifted entropy plateau once van der Waals tails are kept (Wang and Pollet, arXiv:2406.07110); optimized ramps reach spin-liquid correlations over half the system (Vu et al., PRL 2026, arXiv:2512.09040); ground-state topological order with full $1/r^{6}$ tails is unconfirmed.","title":"Is the Rydberg ruby-lattice spin liquid an equilibrium ground 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