20663023597
88%

Ran 02 Jan 2026 06:19PM UTC

Jobs 1

Files 885

Run time 2min

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Committed 02 Jan 2026 04:59PM UTC coverage: 88.311% (-0.01%) from 88.325%

Build # 20663023597

Build Type

push

github

Committed by

web-flow

Commit Message

Use realistic errors in C API test Target (#15491)

Previously, the error rates were ludicrously high, which meant that, in
general, `UnitarySynthesis` could synthesise entangling 2q blocks into
separable states without any 2q gates at all, while maintaining its
configured fidelity target.

For example, the `Target` used in
`test.python.c_api.TestTranspile.test_translate_ecr_basis` has ECR
properties of (approximately):

    (0, 1): (duration=0.976, error=0.094)
    (1, 0): (duration=0.786, error=0.786)

The error on the (1, 0) link is ridiculous, and effectively means that
any synthesis that depends on that error will create pure noise.  Due to
weirdness in the `UnitarySynthesis` "preferred direction" logic as of
Qiskit 2.3.0, the "preferred direction" is chosen based first on the
duration, meaning that the (1, 0) link is chosen, but the _error_ used
in the approximation of this decomposition is not updated to the flipped
error, but instead remains as the (0, 1) error.

The actual root compilation bug here is in the heuristic choices of
`UnitarySynthesis`, but this can be fixed separately in a follow up.
Regardless of those heuristics, the `Target` construction in these C
tests is creating crazy situations but testing as if the backend is
sane.

Run Details

96716 of 109517 relevant lines covered (88.31%)

1209550.96 hits per line

Uncovered Existing Lines

Lines	Coverage	∆	File
4	73.14	-0.08%	crates/circuit/src/parameter/symbol_expr.rs
5	91.77	-0.26%	crates/qasm2/src/lex.rs
12	97.09	-0.94%	crates/qasm2/src/parse.rs

Jobs

ID	Job ID	Ran	Files	Coverage
1	20663023597.1	02 Jan 2026 06:18PM UTC	885	88.31	GitHub Action Run

Qiskit / qiskit / 20663023597
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