CZ implementations may be nonsymmetric, only calibrated locus orders must be used.

CHANGELOG.rst

@@ -2,6 +2,11 @@
 Changelog
 =========
 
+Version 15.6
+============
+
+* CZ gates now appear in the transpilation target only in the direction they are calibrated. `#140 <https://github.com/iqm-finland/qiskit-on-iqm/pull/140>`_
+
 Version 15.5
 ============
 

src/iqm/qiskit_iqm/fake_backends/fake_adonis.py

@@ -13,24 +13,19 @@
 # limitations under the License.
 """Fake backend for IQM's 5-qubit Adonis architecture.
 """
-from iqm.iqm_client import QuantumArchitectureSpecification
-from iqm.qiskit_iqm.fake_backends.iqm_fake_backend import IQMErrorProfile, IQMFakeBackend
+from iqm.qiskit_iqm.fake_backends.iqm_fake_backend import (
+    IQMErrorProfile,
+    IQMFakeBackend,
+    generate_architecture_from_lists,
+)
 
 
 def IQMFakeAdonis() -> IQMFakeBackend:
     """Return IQMFakeBackend instance representing IQM's Adonis architecture."""
-    architecture = QuantumArchitectureSpecification(
-        name="Adonis",
-        operations={
-            "prx": [["QB1"], ["QB2"], ["QB3"], ["QB4"], ["QB5"]],
-            "cc_prx": [["QB1"], ["QB2"], ["QB3"], ["QB4"], ["QB5"]],
-            "cz": [["QB1", "QB3"], ["QB2", "QB3"], ["QB4", "QB3"], ["QB5", "QB3"]],
-            "measure": [["QB1"], ["QB2"], ["QB3"], ["QB4"], ["QB5"]],
-            "barrier": [],
-        },
-        qubits=["QB1", "QB2", "QB3", "QB4", "QB5"],
-        qubit_connectivity=[["QB1", "QB3"], ["QB2", "QB3"], ["QB3", "QB4"], ["QB3", "QB5"]],
-    )
+
+    qubits = ["QB1", "QB2", "QB3", "QB4", "QB5"]
+    qubit_connectivity = [["QB1", "QB3"], ["QB2", "QB3"], ["QB3", "QB4"], ["QB3", "QB5"]]
+    architecture = generate_architecture_from_lists(qubits, qubit_connectivity)
     error_profile = IQMErrorProfile(
         t1s={"QB1": 27000.0, "QB2": 33000.0, "QB3": 25000.0, "QB4": 40000.0, "QB5": 25000.0},
         t2s={"QB1": 20000.0, "QB2": 26000.0, "QB3": 23000.0, "QB4": 26000.0, "QB5": 7000.0},

src/iqm/qiskit_iqm/fake_backends/fake_aphrodite.py

@@ -13,8 +13,11 @@
 # limitations under the License.
 """Fake (i.e. simulated) backend for IQM's 54-qubit Aphrodite architecture
 """
-from iqm.iqm_client import QuantumArchitectureSpecification
-from iqm.qiskit_iqm.fake_backends.iqm_fake_backend import IQMErrorProfile, IQMFakeBackend
+from iqm.qiskit_iqm.fake_backends.iqm_fake_backend import (
+    IQMErrorProfile,
+    IQMFakeBackend,
+    generate_architecture_from_lists,
+)
 
 
 def IQMFakeAphrodite() -> IQMFakeBackend:
@@ -168,17 +171,7 @@ def IQMFakeAphrodite() -> IQMFakeBackend:
         ["QB52", "QB53"],
         ["QB53", "QB54"],
     ]
-    architecture = QuantumArchitectureSpecification(
-        name="Aphrodite",
-        operations={
-            "prx": [[q] for q in qubits],
-            "cz": list(qubit_connectivity),
-            "measure": [[q] for q in qubits],
-            "barrier": [],
-        },
-        qubits=qubits,
-        qubit_connectivity=qubit_connectivity,
-    )
+    architecture = generate_architecture_from_lists(qubits, qubit_connectivity)
 
     error_profile = IQMErrorProfile(
         t1s={

src/iqm/qiskit_iqm/fake_backends/fake_apollo.py

@@ -13,8 +13,11 @@
 # limitations under the License.
 """Fake (i.e. simulated) backend for IQM's 20-qubit Apollo architecture
 """
-from iqm.iqm_client import QuantumArchitectureSpecification
-from iqm.qiskit_iqm.fake_backends.iqm_fake_backend import IQMErrorProfile, IQMFakeBackend
+from iqm.qiskit_iqm.fake_backends.iqm_fake_backend import (
+    IQMErrorProfile,
+    IQMFakeBackend,
+    generate_architecture_from_lists,
+)
 
 
 def IQMFakeApollo() -> IQMFakeBackend:
@@ -73,17 +76,7 @@ def IQMFakeApollo() -> IQMFakeBackend:
         ["QB18", "QB19"],
         ["QB19", "QB20"],
     ]
-    architecture = QuantumArchitectureSpecification(
-        name="Apollo",
-        operations={
-            "prx": [[q] for q in qubits],
-            "cz": list(qubit_connectivity),
-            "measure": [[q] for q in qubits],
-            "barrier": [],
-        },
-        qubits=qubits,
-        qubit_connectivity=qubit_connectivity,
-    )
+    architecture = generate_architecture_from_lists(qubits, qubit_connectivity)
     # Note that these specs are ballpark numbers and don't correspond directly to a specific device
     error_profile = IQMErrorProfile(
         t1s={

src/iqm/qiskit_iqm/fake_backends/iqm_fake_backend.py

@@ -394,3 +394,26 @@ def validate_compatible_architecture(self, architecture: DynamicQuantumArchitect
         connectivity_match = self_connectivity == target_connectivity
 
         return components_match and ops_match and connectivity_match
+
+
+def generate_architecture_from_lists(
+    qubits: list[str], qubit_connectivity: list[list[str]]
+) -> QuantumArchitectureSpecification:
+    """Generate a Dynamic Quantum Architecture from lists of qubits and qubit connectivity.
+
+    Args:
+        qubits: list of qubit names
+        qubit_connectivity: list of lists of qubit pairs representing connectivity
+    """
+    return QuantumArchitectureSpecification(
+        name="Adonis",
+        operations={
+            "prx": [[q] for q in qubits],
+            "cc_prx": [[q] for q in qubits],
+            "cz": list(qubit_connectivity),
+            "measure": [[q] for q in qubits],
+            "barrier": [],
+        },
+        qubits=qubits,
+        qubit_connectivity=qubit_connectivity,
+    )

src/iqm/qiskit_iqm/iqm_backend.py

@@ -118,7 +118,7 @@ def _create_properties(
         if 'prx' in operations:
             target.add_instruction(RGate(Parameter('theta'), Parameter('phi')), _create_properties('prx'))
         if 'cz' in operations:
-            target.add_instruction(CZGate(), _create_properties('cz', symmetric=True))
+            target.add_instruction(CZGate(), _create_properties('cz'))
         if 'move' in operations:
             target.add_instruction(MoveGate(), _create_properties('move'))
         if 'cc_prx' in operations: