Ground-state energy of the [4Fe-4S] iron–sulfur cluster

Find the lowest variational energy of a 54-electron, 36-orbital [4Fe-4S] cluster model; DMRG reaches about −327.24 Eh, the tracker's best entry −327.175.

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1	{
2	"domain": "chemistry-materials",
3	"topics": [
4	"computational-chemistry",
5	"quantum-information"
6	],
7	"type": "algorithm",
8	"cover": {
9	"motif": "atom"
10	},
11	"benchmark": {
12	"task": "Find the lowest variational energy of the [4Fe-4S] (54e, 36o) Hamiltonian",
13	"metric": {
14	"name": "Variational energy (Eh)",
15	"better": "lower"
16	},
17	"baseline": {
18	"name": "TrimCI_202511_6e7 on 4fe_4s_54e_36o (issue #58)",
19	"score": -327.175
20	}
21	},
22	"source": {
23	"key": "quantum-advantage",
24	"name": "Quantum Advantage Tracker",
25	"url": "https://github.com/quantum-advantage-tracker/quantum-advantage-tracker.github.io/tree/main/data/variational-problems/hamiltonians/4fe_4s",
26	"id": "4fe_4s_54e_36o",
27	"curator": "Quantum Advantage Tracker reviewers (IBM, Flatiron Institute, BlueQubit, Algorithmiq and others)",
28	"poser": "IBM and RIKEN (tracker instance); active space from Li and Chan (2017)",
29	"status": "baseline benchmark",
30	"as_of": "2026-10-20",
31	"catalog": "0521c19bbd38"
32	},
33	"review": true,
34	"approval": "first-time"
35	}