Pyqrack

Several minor bugs and edge cases were fixed since v1.18.1. (They might not even effect "weak sampling" in practice.)

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With apologies, `set_weak_sampling(bool)` had a very basic bug.

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To turn on "weak simulation condition" measurement sampling for stabilizer Clifford+RZ, use `set_weak_sampling(bool)`, and disable Schmidt decomposition. This costs a linear factor on multi-shot sampling, proportional to shots, but it's much faster overall. This optional method may be approximate.

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Clifford+RZ special gate set uses ancillary qubits for RZ-injection gadgets. Recently, the development team discovered certain additional cases where gadgets and their ancillae can be combined. On average, this means less work at the sampling phase of Clifford+RZ simulation.

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Yesterday, we nearly had `QUnit` functioning with Clifford+RZ special gate set. However, it was detected after release that more than small amounts of magic lead to state vector conversion, typically. This seems to be fixed. (We can't yet guarantee this, but it seems to work locally.)

Also, `QUnitClifford` file I/O has been debugged.

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Upon further inspection, contrary to prior release notes, Clifford+RZ special gate set did not work with `QUnit`. This has been fixed, in this release.

Also, a new simulation layer `QUnitClifford` has been added, which basically performs a stripped-down `QUnit` algorithm layer directly over `QStabilizer`. Like `QStabilizer`, this layer _can_ be directly instantiated in C++ code, but it is not a universal `QInterface`. `QUnitClifford` is now used below `QStabilizerHybrid` and above `QStabilizer`. Through judicious application of "reactive separation" techniques, the developers observe no appreciable slowdown in stabilizer simulation worst case.

[UPDATE: `QUnit` might still not fully interoperate with `QStabilizerHybrid` Clifford+RZ. However, PyQrack will be updated to parse `QUnitClifford`, which might achieve a similar end for compilation.]

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