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Ran 26 Jun 2024 01:34PM UTC

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Committed 26 Jun 2024 12:06PM UTC coverage: 89.777% (-0.001%) from 89.778%

Job # 9680318090.1

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Commit Message

Simplify QuantumCircuit._from_circuit_data bit handling (#12661)

* Simplify QuantumCircuit._from_circuit_data bit handling

This commit simplifies the logic around bit handling in the
`QuantumCircuit._from_circuit_data()` constructor. Previously it was
calling `add_bits()` for each bit in the `CircuitData` object to update
the output circuit's accounting for each qubit. But this was needlessly
heavy as the `CircuitData` is already the source of truth for the bits
in a circuit and we just need to update the indices dictionary. The
`add_bits()` method attempts to add the bits to the `CircuitData` too
but this is wasted overhead because the `CircuitData` already has the
bits as that's where the came from. This changes the constructor to just
directly set the bit indices as needed and return the circuit.

* Use a dict comprehension instead of a for loop

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