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
unitaryfund/pyqrack@v1.30.26...v1.30.28
v0.9.3...v0.9.4

sha1sum results:
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eff203609424e7b96406ef778e8bcd751e5f6105 pennylane_qrack-0.9.4.tar.gz

Edge case segfault with 0 OpenCL/CUDA devices

This release fixes an edge case that leads to a segmentation fault, when QTensorNetwork is used in the presence of 0 available OpenCL/CUDA devices.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.42...vm6502qv9.9.46
unitaryfund/pyqrack@v1.30.25...v1.30.26
v0.9.2...v0.9.3

sha1sum results:
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06e80c139c8696489f33801161bba11d4f308a17 pennylane_qrack-0.9.3-py3-none-macosx_13_0_x86_64.whl
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12d7f26ae0a8c3ab7dc074ce55f55f526f010689 pennylane_qrack-0.9.3.tar.gz

QBDD deadlock fix (and style)

A potential deadlock in QBDD Kronecker products has been fixed. Beyond that, several (non-breaking) function prototype changes have been made in accordance with standards for style.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.37...vm6502q.v9.9.42
unitaryfund/pyqrack@v1.30.24...v1.30.25
v0.9.1...v0.9.2

sha1sum results:
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7e6ac54390c3463f8ec6a762e8763bf994647772 pennylane_qrack-0.9.2-py3-none-macosx_13_0_x86_64.whl
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0faf76b8f234d16d69d167df429aaca8cf35056f pennylane_qrack-0.9.2.tar.gz

QBDD and stabilizer optimization

QBDD and stabilizer methods have been optimized. An incorrect initialization of a default QEngine property was also fixed in the default constructor (though the incorrect initialization likely had no consequence).

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.33...vm6502q.v9.9.37
unitaryfund/pyqrack@v1.30.23...v1.30.24
v0.9.0...v0.9.1

sha1sum results:
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44d8fd2c3e7ab5eb51d5bee354843f1b5a94cd26 pennylane_qrack-0.9.1-py3-none-macosx_13_0_x86_64.whl
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6bc7e899524f25562b0d3e3451c1715858978b89 pennylane_qrack-0.9.1.tar.gz

Fix wire label map

This release fixes a bug with the wire label map not having any entries. (Blame: @WrathfulSpatula, for not testing prior to release)

Full Changelog: v0.8.8...v0.9.0

sha1sum results:
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Catalyst v0.8 compatibility (and Qrack improvements)

This release builds against the Catalyst v0.8 header, for compatibility.

In Qrack and PyQrack, QBdt and BigInteger (alias bitCapInt) have been debugged. Additionally, one should see drastically improved performance with QBdt (despite significantly reduced parallelism utilization). Systemically, on GNU/Linux, the bitCapInt type now uses 128-bit "words" rather than 64-bit words, which should lead to some performance improvement.

Note that previous releases were almost universally built with capacity for 4095 qubits in a single simulator instance; in practicality, little besides stabilizer simulation can take advantage of the vast majority of this addressing capacity. This release limits to 127 qubits in a single simulator instance, but this is a "feasible" width for Qrack approximation techniques, and performance benefits from the change.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.28...vm6502q.v9.9.33
unitaryfund/pyqrack@v1.30.22...v1.30.23
v0.8.7...v0.8.8

sha1sum results:
5b713ed3b9cc5fbe12c24dfc7c74b5b5496ef4c6 pennylane_qrack-0.8.8-py3-none-macosx_12_0_x86_64.whl
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e84a0937323c67a5590d7596a94b569335a173c1 pennylane_qrack-0.8.8.tar.gz

Stable maintenance release of Qrack (debugging and style)

The past couple of months have seen almost exclusively style and debugging changes in Qrack. (We experimented with fixed-point math for certain applications, but it was only suitable on GNU/Linux, and the experiments mostly proved we are better leaving out fixed-point for now.) This release compared the current head of main branch to the state of Qrack about 2 months ago and whittled down the diff to a small and trustworthy set of bug fixes and adjustments according to style guide.

This release might constitute a relatively "complete" state of the core Qrack project, for a significant amount of time into the future. (Most future development is likely to focus on building out support for other quantum software frameworks.)

Happy Qracking! You rock!

Full Changelog:
v0.8.6...v0.8.7
unitaryfund/pyqrack@v1.30.20...v1.30.22
unitaryfund/qrack@vm6502q.v9.9.23...vm6502q.v9.9.28

sha1sum results:
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71fdfeb4b0f438a6e655cede67fbd2fc92bf93f3 pennylane_qrack-0.8.7.tar.gz

QBdt debugging

QBdt error amortization suffered from an out-of-precision bug; this has been (completely) fixed.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.22...vm6502q.v9.9.23
unitaryfund/pyqrack@v1.30.16...v1.30.20
v0.8.5...v0.8.6

sha1sum results:
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c784ba9d1b0752a6e2972a56cdbda9abbc077c29 pennylane_qrack-0.8.6.tar.gz

OpenCL kernel (and other) optimizations; Ubuntu PowerPC fix

Various micro-optimizations have been added, including OpenCL kernel optimizations. Because of OpenCL kernel updates, perform the following commands as necessary in the qrack repository directory:

$ make clean
$ cmake ..
$ ./qrack_cl_precompile

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.13...vm6502q.v9.9.22
v0.8.4...v0.8.5

sha1sum results:
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a1083eda2b4a130436a986e0ce897bf5b862405e pennylane_qrack-0.8.5.tar.gz

QUnitStateVector and QEngineOCL debugging

A new class QUnitStateVector can hold Schmidt-decomposed representation of state vectors. For now, specifically, it is used only for near-Clifford simulation with QUnitClifford.

A long-standing edge case in QEngineOCL::MAll() has also been fixed.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.9...vm6502q.v9.9.13
v0.8.2...v0.8.4

sha1sum results:
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