Migrate translation stage to plugins (Qiskit#10621)

This commit updates the preset pass manager construction to only use
plugins for the translation stage. To accomplish this the previously
hard coded built-in translation methods, unroller, translator, and
synthesis are migrated to be exposed as built-in plugins. This
simplifies the preset pass manager construction as now the translation
stage is solely built via plugins.

Fixes Qiskit#9456

qiskit/transpiler/preset_passmanagers/builtin_plugins.py

@@ -24,6 +24,57 @@
 from qiskit.transpiler.timing_constraints import TimingConstraints
 
 
+class BasisTranslatorPassManager(PassManagerStagePlugin):
+    """Plugin class for translation stage with :class:`~.BasisTranslator`"""
+
+    def pass_manager(self, pass_manager_config, optimization_level=None) -> PassManager:
+        return common.generate_translation_passmanager(
+            pass_manager_config.target,
+            basis_gates=pass_manager_config.basis_gates,
+            method="translator",
+            approximation_degree=pass_manager_config.approximation_degree,
+            coupling_map=pass_manager_config.coupling_map,
+            backend_props=pass_manager_config.backend_properties,
+            unitary_synthesis_method=pass_manager_config.unitary_synthesis_method,
+            unitary_synthesis_plugin_config=pass_manager_config.unitary_synthesis_plugin_config,
+            hls_config=pass_manager_config.hls_config,
+        )
+
+
+class UnrollerPassManager(PassManagerStagePlugin):
+    """Plugin class for translation stage with :class:`~.BasisTranslator`"""
+
+    def pass_manager(self, pass_manager_config, optimization_level=None) -> PassManager:
+        return common.generate_translation_passmanager(
+            pass_manager_config.target,
+            basis_gates=pass_manager_config.basis_gates,
+            method="unroller",
+            approximation_degree=pass_manager_config.approximation_degree,
+            coupling_map=pass_manager_config.coupling_map,
+            backend_props=pass_manager_config.backend_properties,
+            unitary_synthesis_method=pass_manager_config.unitary_synthesis_method,
+            unitary_synthesis_plugin_config=pass_manager_config.unitary_synthesis_plugin_config,
+            hls_config=pass_manager_config.hls_config,
+        )
+
+
+class UnitarySynthesisPassManager(PassManagerStagePlugin):
+    """Plugin class for translation stage with :class:`~.BasisTranslator`"""
+
+    def pass_manager(self, pass_manager_config, optimization_level=None) -> PassManager:
+        return common.generate_translation_passmanager(
+            pass_manager_config.target,
+            basis_gates=pass_manager_config.basis_gates,
+            method="synthesis",
+            approximation_degree=pass_manager_config.approximation_degree,
+            coupling_map=pass_manager_config.coupling_map,
+            backend_props=pass_manager_config.backend_properties,
+            unitary_synthesis_method=pass_manager_config.unitary_synthesis_method,
+            unitary_synthesis_plugin_config=pass_manager_config.unitary_synthesis_plugin_config,
+            hls_config=pass_manager_config.hls_config,
+        )
+
+
 class BasicSwapPassManager(PassManagerStagePlugin):
     """Plugin class for routing stage with :class:`~.BasicSwap`"""
 

qiskit/transpiler/preset_passmanagers/level0.py

@@ -135,22 +135,10 @@ def _swap_mapped(property_set):
     else:
         layout = None
         routing = None
-    if translation_method not in {"translator", "synthesis", "unroller"}:
-        translation = plugin_manager.get_passmanager_stage(
-            "translation", translation_method, pass_manager_config, optimization_level=0
-        )
-    else:
-        translation = common.generate_translation_passmanager(
-            target,
-            basis_gates,
-            translation_method,
-            approximation_degree,
-            coupling_map,
-            backend_properties,
-            unitary_synthesis_method,
-            unitary_synthesis_plugin_config,
-            hls_config,
-        )
+
+    translation = plugin_manager.get_passmanager_stage(
+        "translation", translation_method, pass_manager_config, optimization_level=0
+    )
 
     if (coupling_map and not coupling_map.is_symmetric) or (
         target is not None and target.get_non_global_operation_names(strict_direction=True)

qiskit/transpiler/preset_passmanagers/level1.py

@@ -207,22 +207,9 @@ def _swap_mapped(property_set):
         layout = None
         routing = None
 
-    if translation_method not in {"translator", "synthesis", "unroller"}:
-        translation = plugin_manager.get_passmanager_stage(
-            "translation", translation_method, pass_manager_config, optimization_level=1
-        )
-    else:
-        translation = common.generate_translation_passmanager(
-            target,
-            basis_gates,
-            translation_method,
-            approximation_degree,
-            coupling_map,
-            backend_properties,
-            unitary_synthesis_method,
-            unitary_synthesis_plugin_config,
-            hls_config,
-        )
+    translation = plugin_manager.get_passmanager_stage(
+        "translation", translation_method, pass_manager_config, optimization_level=1
+    )
 
     if (coupling_map and not coupling_map.is_symmetric) or (
         target is not None and target.get_non_global_operation_names(strict_direction=True)

qiskit/transpiler/preset_passmanagers/level2.py

@@ -196,22 +196,9 @@ def _swap_mapped(property_set):
     else:
         layout = None
         routing = None
-    if translation_method not in {"translator", "synthesis", "unroller"}:
-        translation = plugin_manager.get_passmanager_stage(
-            "translation", translation_method, pass_manager_config, optimization_level=2
-        )
-    else:
-        translation = common.generate_translation_passmanager(
-            target,
-            basis_gates,
-            translation_method,
-            approximation_degree,
-            coupling_map,
-            backend_properties,
-            unitary_synthesis_method,
-            unitary_synthesis_plugin_config,
-            hls_config,
-        )
+    translation = plugin_manager.get_passmanager_stage(
+        "translation", translation_method, pass_manager_config, optimization_level=2
+    )
 
     if (coupling_map and not coupling_map.is_symmetric) or (
         target is not None and target.get_non_global_operation_names(strict_direction=True)

qiskit/transpiler/preset_passmanagers/level3.py

@@ -234,22 +234,10 @@ def _swap_mapped(property_set):
     else:
         layout = None
         routing = None
-    if translation_method not in {"translator", "synthesis", "unroller"}:
-        translation = plugin_manager.get_passmanager_stage(
-            "translation", translation_method, pass_manager_config, optimization_level=3
-        )
-    else:
-        translation = common.generate_translation_passmanager(
-            target,
-            basis_gates,
-            translation_method,
-            approximation_degree,
-            coupling_map,
-            backend_properties,
-            unitary_synthesis_method,
-            unitary_synthesis_plugin_config,
-            hls_config,
-        )
+
+    translation = plugin_manager.get_passmanager_stage(
+        "translation", translation_method, pass_manager_config, optimization_level=3
+    )
 
     if optimization_method is None:
         optimization = PassManager()

setup.py

@@ -134,6 +134,11 @@
             "permutation.basic = qiskit.transpiler.passes.synthesis.high_level_synthesis:BasicSynthesisPermutation",
             "permutation.acg = qiskit.transpiler.passes.synthesis.high_level_synthesis:ACGSynthesisPermutation",
         ],
+        "qiskit.transpiler.translation": [
+            "translator = qiskit.transpiler.preset_passmanagers.builtin_plugins:BasisTranslatorPassManager",
+            "unroller = qiskit.transpiler.preset_passmanagers.builtin_plugins:UnrollerPassManager",
+            "synthesis = qiskit.transpiler.preset_passmanagers.builtin_plugins:UnitarySynthesisPassManager",
+        ],
         "qiskit.transpiler.routing": [
             "basic = qiskit.transpiler.preset_passmanagers.builtin_plugins:BasicSwapPassManager",
             "stochastic = qiskit.transpiler.preset_passmanagers.builtin_plugins:StochasticSwapPassManager",