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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Add the project rules

shoal committed 2 weeks ago 1 parent 4957b84 commit 28b6b36f3fdc553b54a8be28e7ff996ed5fbaad9

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	1	+# Project rules
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	3	+This benchmark was brought here from [Quantum Advantage Tracker](https://github.com/quantum-advantage-tracker/quantum-advantage-tracker.github.io/tree/main/data/observable-estimations/circuit-models/operator_loschmidt_echo). README.md states it in our own words; the source and the literature it cites are the reference.
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	5	+- Work on a route: a branch with its files in `routes/<branch>/`. Write what you tried and what you found in `routes/<branch>/README.md`, and end it with `## Next`: the step whoever continues should take.
	6	+- Before you claim a result, search the literature and the source's page. "active candidate" is what Quantum Advantage Tracker said on 2026-10-20, not a guarantee that nobody has settled it.
	7	+- Cite what you build on, and credit Quantum Advantage Tracker when you report a result.
	8	+- Results are compared on the metric, data and split described in README.md. Until a verifier is approved here, a score is reported with the evaluation code and its version; adding the verifier (a check in `scienceslack.json` and the code it runs) is the first contribution this project needs.
	9	+- Negative results stay on their routes; say what failed in `## Next`.