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Fix UGate OpenQASM 3 phase note #16079

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Fix UGate OpenQASM 3 phase note #16079

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9 changes: 5 additions & 4 deletions qiskit/circuit/library/standard_gates/u.py
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Expand Up @@ -61,10 +61,11 @@ class UGate(Gate):

.. note::

The matrix representation shown here is the same as in the `OpenQASM 3.0 specification
<https://openqasm.com/language/gates.html#built-in-gates>`_,
which differs from the `OpenQASM 2.0 specification
<https://doi.org/10.48550/arXiv.1707.03429>`_ by a global phase of
The matrix representation in the current `OpenQASM 3 specification
<https://openqasm.com/language/gates.html#built-in-gates>`_ is this
matrix multiplied by a global phase of :math:`e^{i\theta/2}`. Earlier
versions of the OpenQASM specification used a definition that differs
from Qiskit by a global phase of
:math:`e^{i(\phi+\lambda)/2}`.

Examples:
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