Remove deprecated `measure` and `reset` circuit operations (#9278)

* Remove measure

* Remove reset

* Add reno

* Update reno

Co-authored-by: Julien Gacon <gaconju@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

qiskit/circuit/measure.py

@@ -14,8 +14,6 @@
 Quantum measurement in the computational basis.
 """
 
-import warnings
-
 from qiskit.circuit.instruction import Instruction
 from qiskit.circuit.exceptions import CircuitError
 
@@ -39,32 +37,3 @@ class Measure(Instruction):
                 yield qarg, [each_carg]
         else:
             raise CircuitError("register size error")
-
-
-def measure(circuit, qubit, clbit):
-    """Measure a quantum bit into classical bit.
-
-    .. deprecated:: Qiskit Terra 0.19
-        Use :meth:`.QuantumCircuit.measure` instead, either by calling
-        ``circuit.measure(qubit, clbit)``, or if a full function is required, then
-        ``QuantumCircuit.measure(circuit, qubit, clbit)``.
-
-    Args:
-        circuit (QuantumCircuit): the quantum circuit to attach the measurement to.
-        qubit (Union[Qubit, int]): the quantum bit to measure
-        clbit (Union[Clbit, int]): the classical bit to store the measurement result in.
-
-    Returns:
-        .InstructionSet: a handle to the created instruction.
-
-    Raises:
-        CircuitError: if either bit is not in the circuit, or is in a bad format.
-    """
-    warnings.warn(
-        "The loose 'measure' function is deprecated as of Qiskit Terra 0.19, and will be removed"
-        " in a future release.  Instead, you should call 'circuit.measure(qubit, clbit)', or if you"
-        " need a function, you can do `QuantumCircuit.measure(circuit, qubit, clbit)'.",
-        category=DeprecationWarning,
-        stacklevel=2,
-    )
-    return circuit.measure(qubit, clbit)

qiskit/circuit/reset.py

@@ -14,8 +14,6 @@
 Qubit reset to computational zero.
 """
 
-import warnings
-
 from qiskit.circuit.instruction import Instruction
 
 
@@ -29,30 +27,3 @@ class Reset(Instruction):
     def broadcast_arguments(self, qargs, cargs):
         for qarg in qargs[0]:
             yield [qarg], []
-
-
-def reset(circuit, qubit):
-    """Reset a quantum bit on a circuit.
-
-    .. deprecated:: Qiskit Terra 0.19
-        Use :meth:`.QuantumCircuit.reset` instead, either by calling ``circuit.reset(qubit)``, or if
-        a full function is required, then ``QuantumCircuit.reset(circuit, qubit)``.
-
-    Args:
-        circuit (QuantumCircuit): the quantum circuit to attach the reset operation to.
-        qubit (Union[Qubit, int]): the quantum bit to reset
-
-    Returns:
-        .InstructionSet: a handle to the created instruction.
-
-    Raises:
-        CircuitError: if the qubit is not in the circuit, or is in a bad format.
-    """
-    warnings.warn(
-        "The loose 'reset' function is deprecated as of Qiskit Terra 0.19, and will be removed"
-        " in a future release.  Instead, you should call 'circuit.reset(qubit)', or if you"
-        " need a function, you can do `QuantumCircuit.reset(circuit, qubit)'.",
-        category=DeprecationWarning,
-        stacklevel=2,
-    )
-    return circuit.reset(qubit)

releasenotes/notes/remove-deprecated-ops-d01b83362c3557ca.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Remove ``qiskit.circuit.measure.measure`` and ``qiskit.circuit.reset.reset`` 
+    functions deprecated since 0.19.

test/python/circuit/test_circuit_operations.py

@@ -1114,32 +1114,6 @@ class TestCircuitOperations(QiskitTestCase):
         self.assertEqual(qc.num_clbits, 10)
         self.assertEqual(qc.num_ancillas, 10)
 
-    def test_deprecated_measure_function(self):
-        """Test that the deprecated version of the loose 'measure' function works correctly."""
-        from qiskit.circuit.measure import measure
-
-        test = QuantumCircuit(1, 1)
-        with self.assertWarnsRegex(DeprecationWarning, r".*Qiskit Terra 0\.19.*"):
-            measure(test, 0, 0)
-
-        expected = QuantumCircuit(1, 1)
-        expected.measure(0, 0)
-
-        self.assertEqual(test, expected)
-
-    def test_deprecated_reset_function(self):
-        """Test that the deprecated version of the loose 'reset' function works correctly."""
-        from qiskit.circuit.reset import reset
-
-        test = QuantumCircuit(1, 1)
-        with self.assertWarnsRegex(DeprecationWarning, r".*Qiskit Terra 0\.19.*"):
-            reset(test, 0)
-
-        expected = QuantumCircuit(1, 1)
-        expected.reset(0)
-
-        self.assertEqual(test, expected)
-
     def test_from_instructions(self):
         """Test from_instructions method."""