Debug shared library observables API

This release fixes bugs in the observables API of the shared library. (It also fixes 16-bit floating-point builds, but this does not affect the packaged artifacts.)

Full Changelog: vm6502q.v9.9.7...vm6502q.v9.9.8

sha1sum results:
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QUnit refactor

This patch release refactors QUnit for code clarity and reuse. No bugs have been fixed; no features have been added; the performance differential might be entirely negligible. However, the improvement in source code is authoritative.

Full Changelog: vm6502q.v9.9.6...vm6502q.v9.9.7

sha1sum results:
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Fixed-point QUnit

QUnit now takes advantage of fixed-point math, when available. (This should only improve QUnit precision while keeping the same rounding thresholds.)

Full Changelog: vm6502q.v9.9.1...vm6502q.v9.9.6

sha1sum results:
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Debug multi-GPU Clifford+RZ environment variable

This release fixes a bug that prevented custom tuning of the maximum ancillary qubit count in QStabilizerHybrid via QRACK_MAX_PAGING_QB. (This mostly affects cases of multi-GPU simulation with near-Clifford optimization, only.)

Full Changelog: vm6502q.v9.9.0...vm6502q.v9.9.1

sha1sum results:
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Optional depolarizing noise layer

This release adds an (optional) depolarizing noise simulation "layer" to Qrack, for simple noisy simulation, such as to test and aid the development of quantum error mitigation or quantum error correction.

What's Changed

• Add PhaseRootNMask to QInterface, implement for QEngineCPU by @jpacold in #1009
• Windows artifact build by @WrathfulSpatula in #1010
• Fix automatic Windows artifacts build by @WrathfulSpatula in #1011
• Fixed-point for QBDD by @WrathfulSpatula in #1013
• QInterfaceNoisy by @WrathfulSpatula in #1014

New Contributors

• @jpacold made their first contribution in #1009

Full Changelog: vm6502q.v9.7.0...vm6502q.v9.9.0

sha1sum results:
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Observables API

This release greatly expands the API for expectation values and variance, via both static and shared linkage.

File SHA-1 sums:

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Debug Clifford+RZ special case simulation

This release fixes a bug or edge case involving combining RZ-injection gadget ancillary qubits in "hybrid stabilizer" optimization layer.

In the initial release, due to changes in the build environments at my disposal, we will not include CUDA or WASM builds, for now. Depending on the demand for pre-compiled artifacts for these platforms, I might add them to this release after-the-fact, when I have the appropriate build environments, if we don't iterate code changes sooner.

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Variance and probability in shared library

VarianceBitsAll() and ProbBitsAll() observable output methods have been exposed through the shared library interface, to back prob_all() and variance() in PyQrack's QrackSimulator.

File SHA256 sums:

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Automatic homogeneous multi-accelerator

For homogeneous multi-device systems, it is usually no longer necessary to explicitly specify constructor or environment variable configuration of multi-GPU parallelism (for default optimal stack and in general, according to use case). The behavior of the existing configuration variables remains unchanged, otherwise.

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"Foolproof" reactive separation default

Qrack's longstanding strategy about "reactive separation" setting has been to optimize for (special case) minimum memory footprint. (We have generally and publicly advised, as in our white paper and its accompanying notebooks to exactly reproduce our reported benchmarks, that users should make a consciously-considered choice whether to override the setting for their case.) However, it is likely that most users, when they are not using SDRP, would prefer that Qrack optimizes by default for minimum execution time. As such, when SDRP is default ("ideal") value or lower, reactive separation setting now defaults to "off"; when SDRP is in use, reactive separation defaults to "on." After setting or changing SDRP value, the default behavior will re-engage, but it can then be overridden with the method to manually set reactive separation option. (This adds no new functionality versus many previous releases, but it takes the responsibility off the "lazy" user.)

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