Improved try_separate_tolerance()

try_separate_tolerance() has been improved, to avoid unnecessary entanglement when called with isSchmidtDecompose=True. As decompose() also turns out to be a unitary operation in general, separate() no longer proactively normalizes its output subsystems.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.11.8...vm6502q.v9.11.12
v1.32.6...v1.32.7

sha1sum results:
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Debug QUnit Decompose() edge case

QUnit::Decompose() had a long-standing bug: it failed to reindex QUnit "shards" in the destination simulation. This was fixed in a release yesterday, but the change introduced another problem in the indexing of the original simulator instance. Both issues have been fixed, in the current release.

Full Changelog:
unitaryfund/qrack@vm6502qv9.11.4...vm6502q.v9.11.8
v1.32.5...v1.32.6

sha1sum results:
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Improve separate() phase

separate() and decompose()/dispose() phase angles are now weighted by contributing-amplitude probability (from the L2 norm).

Full Changelog:
unitaryfund/qrack@vm6502q.v9.11.0...vm6502qv9.11.4
v1.32.0...v1.32.5

sha1sum results:
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separate() and normalize()

This adds the methods separate() and normalize() to QrackSimulator. separate() forces entanglement-breaking between the target subsystem and all other qubits (without condition). normalize() is a necessary component to achieve separate() manually via decompose().

A bug was fixed in QUnit::Decompose() in the course of testing separate().

Full Changelog: v1.31.1...v1.32.0

sha1sum results:
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SDRP/MPS correspondence base case

With all-to-all connectivity (but 0 bond dimension), SDRP (Schmidt decomposition rounding parameter) should reproduce the effective behavior of MPS (matrix product states) when the rounding parameter is set to 1 or greater: this release fixes the QUnit implementation to realize this theoretical expectation. (Disable QStabilizerHybrid layer with isStabilizerHybrid=False constructor parameter for QrackSimulator and set the rounding parameter >= 1 to see this behavior, but the loss of "hybrid stabilizer" optimization should not qualitatively hurt performance in this case.)

Full Changelog:
unitaryfund/qrack@vm6502q.v9.10.0...vm6502q.v9.10.1
v1.31.0...v1.31.1

sha1sum results:
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Better sampling; out_probs(); noise constructor argument

Multi-shot measurement in QEngine was previously handled in a way that was technically not thread-safe for C++. This has been fixed, and QEngine sampling has been parallelized further.

The OutProbs() method has been added to the Qrack shared library extern C API, which returns the L2 norm of each OutKet() amplitude in same order. This corresponds with QrackSimulator.out_probs().

isNoisy constructor argument has been replaced with noise float parameter, which enable noisy simulation if the parameter is greater than 0 and sets the simulator instance noise level to the value of the constructor parameter.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.62...vm6502q.v9.10.0
v1.30.31...v1.31.0

sha1sum results:
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Debug QBDD high rounding

If QRACK_QBDT_SEPARABILITY_THRESHOLD were set too high, it would previously lead to segmentation faults. This release should allow the rounding parameter to be set almost arbitrarily high.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.58...vm6502q.v9.9.62
v1.30.30...v1.30.31

sha1sum results:
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Debug QBDD sampling

This release fixes doubling-up of QBDD measurement sampling.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.54...vm6502q.v9.9.58
v1.30.29...v1.30.30

sha1sum results:
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QBDD optimization

A number of improvements have been made in QBDD simulation:

• PushStateVector() has more consistent flooring logic for very small contributions to overall state vector probability.
• Because QBDD gains little advantage from internal parallelism in most cases, internal parallelism in QBDD now defaults to OFF.
• If QBDD internal parallelism is off, then QTensorNetwork automatically parallelizes QBDD measurement sampling over shots

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.50...vm6502q.v9.9.54
v1.30.28...v1.30.29

sha1sum results:
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0-GPU edge case; env. vars.; precision

This release fixes the following:

• an edge case that leads to a segmentation fault when QStabilizerHybrid is used in the presence of 0 available OpenCL/CUDA devices,
• potentially inconsistent defaults for qubit-limit and rounding-parameter environment variables,
• and rounding neighborhood for separability checks,if we check a two-state qubit for eigenstate norm equality: "machine epsilon" in C++ is the difference between 1.0 and the next greater representable number; half this value is the difference between 1.0 and the next lower representable number; half this value is used for (L2-norm) rounding neighborhood for equality with 1.0 or 0.0 in two-state Hilbert spaces (which are bounded to that range and must normalize to 1.0).

Full Changelog:
unitaryfund/qrack@vm6502qv9.9.46...vm6502q.v9.9.50
v1.30.26...v1.30.28

sha1sum results:
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