Fix issue with spin_op
result retrieval
#1440
Merged
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Description
We have the logic to expand the term strings (used as index keys) for result look-up but it was limited to single-qubit cases (e.g., only expanding Z0 but not Z1 to the target number of qubits).
This caused the issue reported in #1396 whereby the second
spin_op
in that list is Z1. It wasn't expanded properly, hence reported as a zero result.This PR fixed the issue and added a test based on the bug report.
Resolved #1396