Fix sparse matrix with global phase

albi3ro commented 2 months ago

Calculating the sparse matrix for a product containing a global phase was causing an error:

op = qml.GlobalPhase(0.5) @ qml.X(0) @ qml.X(0)
op.sparse_matrix(wire_order=(0,1))

expand_matrix was not able to handle an operator with no wires. So this is just a little patch for that case.

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codecov[bot] commented 2 months ago

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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```diff @@ Coverage Diff @@ ## v0.38.0-rc0 #6197 +/- ## ============================================== Coverage ? 99.66% ============================================== Files ? 445 Lines ? 42389 Branches ? 0 ============================================== Hits ? 42247 Misses ? 142 Partials ? 0 ```

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PennyLaneAI / pennylane

Fix sparse matrix with global phase #6197

Codecov Report