Preserve bit locations through pickle #13980
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Previously when we were pickling a DAGCircuit the bit locations fields were forgotten about. So when we loaded a DAGCircuit from a pickle the bit locations were empty. This would cause any call to find_bit() to raise an error because there was no entry for any of the bits in the dag. This commit fixes this by reconstructing the bit locations on __setstate__ by iterating over the dag's qubits and clbits. Fixes Qiskit#13976
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Changelog: Bugfix
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kevinhartman
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Mar 12, 2025
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Summary
Previously when we were pickling a DAGCircuit the bit locations fields were forgotten about. So when we loaded a DAGCircuit from a pickle the bit locations were empty. This would cause any call to find_bit() to raise an error because there was no entry for any of the bits in the dag. This commit fixes this by reconstructing the bit locations on setstate by iterating over the dag's qubits and clbits.
Details and comments
Fixes #13976