Remove CXCancellation (deprecated in 1.1)

qiskit/transpiler/__init__.py

@@ -107,11 +107,10 @@
 
     import numpy as np
     from qiskit.providers.fake_provider import GenericBackendV2
-    from qiskit.circuit.library import HGate, PhaseGate, RXGate, TdgGate, TGate, XGate
+    from qiskit.circuit.library import HGate, PhaseGate, RXGate, TdgGate, TGate, XGate, CXGate
     from qiskit.transpiler import PassManager, generate_preset_pass_manager
     from qiskit.transpiler.passes import (
         ALAPScheduleAnalysis,
-        CXCancellation,
         InverseCancellation,
         PadDynamicalDecoupling,
     )
@@ -132,7 +131,7 @@
     ]
     logical_opt = PassManager(
         [
-            CXCancellation(),
+            InverseCancellation([CXGate()]),
             InverseCancellation(inverse_gate_list),
         ]
     )

qiskit/transpiler/passes/__init__.py

@@ -75,7 +75,6 @@
    CollectLinearFunctions
    CollectCliffords
    ConsolidateBlocks
-   CXCancellation
    InverseCancellation
    CommutationAnalysis
    CommutativeCancellation
@@ -230,7 +229,6 @@
 from .optimization import CommutationAnalysis
 from .optimization import CommutativeCancellation
 from .optimization import CommutativeInverseCancellation
-from .optimization import CXCancellation
 from .optimization import Optimize1qGatesSimpleCommutation
 from .optimization import OptimizeSwapBeforeMeasure
 from .optimization import RemoveResetInZeroState

qiskit/transpiler/passes/optimization/__init__.py

@@ -20,7 +20,6 @@
 from .commutation_analysis import CommutationAnalysis
 from .commutative_cancellation import CommutativeCancellation
 from .commutative_inverse_cancellation import CommutativeInverseCancellation
-from .cx_cancellation import CXCancellation
 from .optimize_1q_commutation import Optimize1qGatesSimpleCommutation
 from .optimize_swap_before_measure import OptimizeSwapBeforeMeasure
 from .remove_reset_in_zero_state import RemoveResetInZeroState

releasenotes/notes/remove_cxcancellation_11937-1d225c4331b7b4e2.yaml

@@ -0,0 +1,6 @@
+---
+upgrade_transpiler:
+  - |
+    The pass ``qiskit.transpiler.passes.CXCancellation`` was removed. It was deprecated in favor of
+    class:`.InverseCancellation`, which is more generic.
+    ``CXCancellation`` is fully semantically equivalent to ``InverseCancellation([CXGate()])``.