Operator Loschmidt echo circuits on 49 to 70 qubits

Classically estimate an operator Loschmidt echo on 49- to 70-qubit circuits, where IBM hardware and classical simulations still disagree.

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1	{
2	"domain": "physics-astronomy",
3	"topics": [
4	"quantum-information",
5	"scientific-computing"
6	],
7	"type": "algorithm",
8	"benchmark": {
9	"task": "Estimate classically the operator Loschmidt echo of fixed 49–70-qubit circuits",
10	"metric": {
11	"name": "Error-bar width on the echo value (dimensionless)",
12	"better": "lower"
13	}
14	},
15	"source": {
16	"key": "quantum-advantage",
17	"name": "Quantum Advantage Tracker",
18	"url": "https://github.com/quantum-advantage-tracker/quantum-advantage-tracker.github.io/tree/main/data/observable-estimations/circuit-models/operator_loschmidt_echo",
19	"id": "operator_loschmidt_echo",
20	"curator": "Quantum Advantage Tracker reviewers (IBM, Flatiron Institute, BlueQubit, Algorithmiq and others)",
21	"poser": "Algorithmiq, IBM and Flatiron Institute",
22	"status": "active candidate",
23	"as_of": "2026-10-20",
24	"catalog": "0521c19bbd38"
25	}
26	}