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Fix staggered dynamical decoupling for disjoint coupling maps #701
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Summary
Staggered dynamical decoupling uses the
backend.coupling_map()to classify the qubits into 2 sets with different delays.Due to a check in the reduce method of a coupling map, this was failing if not all qubits are connected.
Details and comments
This PR circumvents the issue by getting the subgraph directly as suggested in Qiskit/qiskit#9710 (comment)