qiskit/releasenotes/notes/0.17/quantumcircuit-optional-reg...

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---
deprecations:
- |
Accessing references from :class:`~qiskit.circuit.Qubit` and
:class:`~qiskit.circuit.Clbit` instances to their containing registers
via the :attr:`~qiskit.circuit.Qubit.register` or
:attr:`~qiskit.circuit.Qubit.index` properties has been deprecated and will
be removed in a future release. Instead, :class:`~qiskit.circuit.Register`
objects can be queried to find the :class:`~qiskit.circuit.Bit` objects
they contain.