Qiskit / qiskit / 8606366314

89%

main: 88%

Build Type

push

github

Committed by web-flow

Commit Message

Improve performance and randomness of `QuantumVolume` (#12097)

* Improve performance and randomness of `QuantumVolume`

This hugely improves the construction time of `QuantumVolume` circuits,
in part by removing the previous behaviour of using low-entropy
indiviual RNG instances for each SU4 matrix.  Now that we need larger
circuits, this would already have been a non-trivial biasing of the
random outputs, but also, calling Scipy random variates in a loop is
_much_ less efficient than vectorising the entire process in one go.

Along with changes to the RNG, this commit also adds a faster path to
`UnitaryGate` to shave off some useless repeated calculations (this can
likely be used elsewhere in Qiskit) and reworks the `QuantumVolume`
builder to use more efficient circuit construction methods.

* Make test explicitly test reproducibility

* Protect best-effort seed retrieval against old Numpy

Run Details

26 of 26 new or added lines in 2 files covered. (100.0%)

22 existing lines in 2 files now uncovered.

60297 of 67464 relevant lines covered (89.38%)

234078.59 hits per line