qiskit/releasenotes/notes/1.0/fixes_10744-83e5f33f5db74a2...

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upgrade_circuits:
- |
The properties ``Bit.register`` and ``Bit.index`` are removed. They were deprecated in
Qiskit 0.25 (released in 2021-04). The qubits and bits now live only in the context of
a :class:`.QuantumCircuit`. The alternative to the properties is
to use :meth:`.QuantumCircuit.find_bit` to find all the containing
registers within a circuit and the index of the bit within the
circuit.