{

"family": "xxz-chain-disordered",

"description": "Open XXZ spin-1/2 chain at the Heisenberg point (J = 1, Delta = 1) with random on-site Z fields drawn uniformly from [-1, 1], started from a random Z-basis product state with independently sampled spins, each up with probability 0.6. Observable: <Z_i>(t) on every site at 41 times in [0, 20]. Total magnetisation is conserved.",

"hamiltonian": {

"type": "xxz_chain",

"J": 1.0,

"delta": 1.0,

"field": {

"dist": "uniform",

"W": 1.0

}

},

"initial_state": {

"type": "random_product_z",

"p_up": 0.6

},

"observable": {

"pauli": "Z",

"sites": "all"

},

"times": {

"T": 20.0,

"num": 41

},

"exact": {

"size": 18

},

"scaling": {

"size": 32

},

"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": 20,

"seed": 20261113

}

}

​