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{
"family": "heisenberg-2d-open",
"description": "Open 4 x 4 square-lattice Heisenberg antiferromagnet (J = 1 on every nearest-neighbour bond) with random on-site Z fields drawn uniformly from [-1, 1], started from the Neel state. Observable: <Z_i>(t) on every site (row-major, site = x * Ly + y) at 41 times in [0, 10]. Total magnetisation is conserved. The scaling instance is a 6 x 6 lattice.",
"hamiltonian": {
"type": "heisenberg_2d",
"J": 1.0,
"field": {
"dist": "uniform",
"W": 1.0
}
},
"initial_state": {
"type": "neel"
},
"observable": {
"pauli": "Z",
"sites": "all"
},
"times": {
"T": 10.0,
"num": 41
},
"exact": {
"size": [
4,
4
]
},
"scaling": {
"size": [
6,
6
]
},
"budget_seconds": {
"exact_suite": 240,
"scaling": 240,
"accuracy_probe": 60
},
"conserved": [
"total_z"
],
"score": {
"metric": "mean_instance_max_abs_error",
"round_for_display_only": true
},
"suite": {
"version": "public-v2",
"seeds": [
20261013,
20261014,
20261015,
20261016,
20261017,
20261018,
20261019,
20261020,
20261021,
20261022
],
"source_independent": true
},
"accuracy_probe": {
"size": [
4,
5
],
"seed": 20261113
}
}