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	+}