Copying circuit wire_names

src/qibo/models/circuit.py

@@ -325,6 +325,7 @@ def wire_names(self, wire_names: Union[list, dict]):
             ]
         else:
             self._wire_names = [f"q{i}" for i in range(self.nqubits)]
+        self.init_kwargs["wire_names"] = self._wire_names
 
     @property
     def repeated_execution(self):

src/qibo/transpiler/optimizer.py

@@ -27,7 +27,10 @@ def __call__(self, circuit: Circuit) -> Circuit:
             )
         if logical_qubits == physical_qubits:
             return circuit
-        new_circuit = Circuit(physical_qubits)
+        new_wire_names = circuit.wire_names + list(
+            self.connectivity.nodes - circuit.wire_names
+        )
+        new_circuit = Circuit(nqubits=physical_qubits, wire_names=new_wire_names)
         for gate in circuit.queue:
             new_circuit.add(gate)
         return new_circuit
@@ -48,7 +51,7 @@ def __init__(self, max_qubits: int = 1):
 
     def __call__(self, circuit: Circuit):
         fused_circuit = circuit.fuse(max_qubits=self.max_qubits)
-        new = circuit.__class__(circuit.nqubits)
+        new = Circuit(**circuit.init_kwargs)
         for fgate in fused_circuit.queue:
             if isinstance(fgate, gates.FusedGate):
                 new.add(gates.Unitary(fgate.matrix(), *fgate.qubits))

src/qibo/transpiler/placer.py

@@ -461,7 +461,7 @@ def _assemble_circuit(self, circuit: Circuit):
             gates_qubits_pairs.reverse()
         assembled_gates_qubits_pairs += gates_qubits_pairs[0:remainder]
 
-        new_circuit = Circuit(circuit.nqubits)
+        new_circuit = Circuit(**circuit.init_kwargs)
         for qubits in assembled_gates_qubits_pairs:
             # As only the connectivity is important here we can replace everything with CZ gates
             new_circuit.add(gates.CZ(qubits[0], qubits[1]))