qiskit/releasenotes/notes/1.3/improve-hls-qubit-tracking-...

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features_transpiler:
- |
Improved handling of ancilla qubits in the :class:`.HighLevelSynthesis`
transpiler pass. For example, a circuit may have custom gates whose
definitions include :class:`.MCXGate`\s. Now the synthesis algorithms
for the inner MCX-gates can use the ancilla qubits available on the
global circuit but outside the custom gates' definitions.