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Qiskit
Implement arithmetic on `SparseObservable`
Summary
The simple arithmetic operators of addition, subtraction, multiplication, division and tensor product are in line with other quantum_info objects, including coercion from other objects (though better behaved on failed coercions, in many cases).
Where appopriate, in-place operations will re-use the existing allocations. The tensor product cannot really be done in place, so it doesn't define a special __rxor__ operator, but it inherits the standard Python behaviour of this being derived from __xor__.
There are further mathematical operations to add around composition and evolution, and to apply a TranspileLayout to the observable. All of these, in the quantum_info style either directly deal with a layout, or take a qargs argument that is effectively a sublayout for the right-hand side of the operation. These will be added in a follow-up.
Details and comments
Built on top of #12671, so depends on it.
One or more of the following people are relevant to this code:
@Qiskit/terra-core
Pull Request Test Coverage Report for Build 11576212029
Details
- 375 of 410 (91.46%) changed or added relevant lines in 1 file are covered.
- 16 unchanged lines in 2 files lost coverage.
- Overall coverage increased (+0.008%) to 88.693%
| Changes Missing Coverage | Covered Lines | Changed/Added Lines | % |
|---|---|---|---|
| crates/accelerate/src/sparse_observable.rs | 375 | 410 | 91.46% |
| <!-- | Total: | 375 | 410 |
| Files with Coverage Reduction | New Missed Lines | % |
|---|---|---|
| crates/qasm2/src/lex.rs | 4 | 91.98% |
| crates/qasm2/src/parse.rs | 12 | 97.15% |
| <!-- | Total: | 16 |
| Totals | |
|---|---|
| Change from base Build 11572090796: | 0.008% |
| Covered Lines: | 75349 |
| Relevant Lines: | 84955 |
