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). Thanks to @eltociear, for fixing a documentation typo.

What's Changed

• docs: update README.md by @eltociear in #1016
• QBDD and stabilizer commits by @WrathfulSpatula

New Contributors

• @eltociear made their first contribution in #1016

Full Changelog: vm6502q.v9.9.33...vm6502q.v9.9.37

sha1sum results:
0414c5f161399be0ab1ddeaacc6db63c251e27d8 libqrack-macosx_14_0_arm64.zip
6abd0137b202d83a606dd1231e599c803a273ede libqrack-manylinux2014_x86_64.zip
b11b75ea442dcbf93215b1b674c1c121d7222e93 libqrack-manylinux_2_35_x86_64.zip
5dcf2c19b0cd52d189ae370c372f95ff8b7b703d libqrack-manylinux_2_39_x86_64.zip
aea03051ff888f9c7ef5f553f89b91e971113e25 libqrack-win-amd64.zip

QBdt and BigInteger debugging and performance

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: vm6502q.v9.9.28...vm6502q.v9.9.33

sha1sum results:
9ba920d97dad5f875eddcd6173b24fd1fcda0753 libqrack-macosx_14_0_arm64.zip
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eb71b04fb850d2e0a7e711a2b323ed1785cdf8b2 libqrack-manylinux_2_35_x86_64.zip
cb62ec1a7ad04aa2872651043e1982e52c46a2d1 libqrack-manylinux_2_39_x86_64.zip
8253231acf756d7a129cdb1a751bc76881a61238 libqrack-win-amd64.zip

Stable maintenance release (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: vm6502q.v9.9.23...vm6502q.v9.9.28

sha1sum results:
e42ac6f6fa8a0d712042ecbaa4ca4b4df56eafda libqrack-macosx_14_0_arm64.zip
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053856d53648ff3c03e611608831296eba783a4c libqrack-win-amd64.zip

QBdt debugging

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

Full Changelog: vm6502q.v9.9.22...vm6502q.v9.9.23

sha1sum results:
d31a4dd5624ae32eac6fde9c0e5d1ba4ae55113c libqrack-macosx_14_0_arm64.zip
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ced693d326d76e82889fc9b5be0fe29b5e5eda7d libqrack-manylinux_2_39_x86_64.zip
f8bb6f5f5f874127b5b899b974fe6b2f86198b41 libqrack-win-amd64.zip

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: vm6502q.v9.9.13...vm6502q.v9.9.22

sha1sum results:
e3ad258882c26cc9b630f4188c233b386bb078f4 libqrack-macosx_14_0_arm64.zip
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0482af5afc787b307be89c6d94f6ab7996e68361 libqrack-win-amd64.zip

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: vm6502q.v9.9.9...vm6502q.v9.9.13

sha1sum results:
79f7b51945a02769ff45892363d34831c0549587 libqrack-macosx_14_0_arm64.zip
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004c2fd26a79be9bb62a530920e52d61f3fc1bbd libqrack-win-amd64.zip

Random number generation improvements

Minor improvements have been made to Qrack's random number generator API. Most importantly, 32 divisions have been replaced with 32 multiplications when generating a random float with Rand(). Another possible point of improvement is that most-significant bit of the raw random bit stream now corresponds with most-significant bit of Rand(), where some devices and services for random number generation will tend to prioritize most-significant bit as slightly less biased for randomness than least-significant.

Full Changelog: vm6502q.v9.9.8...vm6502q.v9.9.9

sha1sum results:
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c4d91a6a5fa2c62b5fef93b006de79d473b23257 libqrack-win-amd64.zip

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:
bfcb8d4947438169d41b2239bd0a23d7cdd41324 libqrack-macosx_14_0_arm64.zip
87531e6d58f1a693f63ab246726c8b31a118781c libqrack-manylinux2014_x86_64.zip
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89bf709ebe9de530d620b26192b1c5da0734e2d2 libqrack-win-amd64.zip

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:
d23b9a4baacb67dbcd798640fa3932bf676789a9 libqrack-macosx_14_0_arm64.zip
353f36459841516fa67b0a2363b22ace82816ef2 libqrack-manylinux2014_x86_64.zip
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5c501223e7c12a479d61606cf89e988a1d5d3c6c libqrack-manylinux_2_39_x86_64.zip
061d1077293602adc4ecec4ed1bbb314cdb2be62 libqrack-win-amd64.zip

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:
bc68840a315f6cf9ff75b5d4b2672dcf05e418d7 libqrack-macosx_14_0_arm64.zip
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