qiskit/releasenotes/notes/0.15/4524-MCXVChain-gate-being-i...

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---
upgrade:
- |
Implementations of the multi-controlled X Gate (
:class:`~qiskit.circuit.library.MCXGrayCode`,
:class:`~qiskit.circuit.library.MCXRecursive`, and
:class:`~qiskit.circuit.library.MCXVChain`) have had their ``name``
properties changed to more accurately describe their
implementation: ``mcx_gray``, ``mcx_recursive``, and
``mcx_vchain`` respectively. Previously, these gates shared the
name ``mcx`` with :class:`~qiskit.circuit.library.MCXGate`, which caused
these gates to be incorrectly transpiled and simulated.