Pyqrack

QStabilizerHybrid` has been fundamentally improved, particularly for the gate set "Clifford+RZ" (or "Clifford+T"). The entire unitary portion of circuit simulation, before measurement, now has a polynomial-complexity simulation algorithm, in space and time requirements. If measuring across the full width of the simulator, or sampling, measurement (alone) scales exponentially in space requirements proportional to (less than or up to) the number of non-Clifford `RZ` (or `T`) gates, and exponentially in time requirements proportional to base logical qubit count in the simulator instance.

No special considerations are necessary to engage this simulation mode: simply restrict your gate set to Clifford+RZ, when using any simulator that properly includes the `QStabilizerHybrid` layer, such as the default optimal simulator stack.

(UPDATE: Actually, it turns out that the default optimal stack, with `QUnit`, will apparently work for Clifford+T, but not Clifford+RZ. For Clifford+RZ, use `QStabilizerHybrid` _without_ `QUnit`.)

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This fixes the instability due to T-gadget injection in the last patch release.

Apologies for the instability in the last several patch releases: we are hard at work at trying to improve QStabilizerHybrid performance on Clifford+T benchmarks. Happily, there seems to be a promising route forward, and methods like GetAmplitude() have already seen meaningful improvements. More will follow, on Clifford+T simulation!

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(In the underlying C++ library...)

A performance regression in test_qft_cosmology with QStabilizerHybrid has been fixed. QStabilizer and QStabilizerHybrid have been refactored for code standards.

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[pyqrack-1.13.4.tar.gz](https://github.com/unitaryfund/pyqrack/files/11729781/pyqrack-1.13.4.tar.gz)

(In the underlying C++ library...)

This release fixes the bugged edge cases of the previous patch release, in `QStabilizerHybrid`.

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(With apologies:) This release only fixes the source build installation from PyPi.

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(In the underlying C++:)

The commutation relations used for ancilla in Prob() and ForceM() have been improved in QStabilizerHybrid. Also, unnecessary copies of SIMD data types have been removed in QBdt.

(EDIT: By mistake, the all-binary *.tar.gz source wheel was uploaded. Below is the `main` branch source.)

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