Swap removal fix #38
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Swap removal fix #38
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ElePT
approved these changes
Oct 25, 2024
| @@ -34,8 +32,7 @@ def run(self, dag: DAGCircuit): | |||
| successors = list(dag.successors(node)) | |||
| if len(successors) == 2: | |||
| if all(isinstance(successors[idx], DAGOutNode) for idx in [0, 1]): | |||
| bits = [qreg.index(qubit) for qubit in node.qargs] | |||
| qmap[bits[0]], qmap[bits[1]] = qmap[bits[1]], qmap[bits[0]] | |||
| qmap.swap(node.qargs[0], node.qargs[1]) | |||
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Summary
This PR fixes #37
Details and comments
The way the layout is permuted in the SWAP cancellation pass is modified.
This PR adds a test to catch this issue.