Fix bug in writer for SWAP instruction.

CHANGELOG.md

@@ -10,7 +10,13 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 * **Removed** for now removed features.
 
 
-## [ 0.3.0 ] - [ xxxx-yy-zz ]
+## [0.4.0] - [ xxxx-yy-zz ]
+
+### Fixed
+
+- Bug in the writing of SWAP instructions.
+
+## [ 0.3.0 ] - [ 2025-01-30 ]
 
 ### Added
 

opensquirrel/writer/writer.py

@@ -66,7 +66,7 @@ def visit_gate(self, gate: Gate) -> None:
         gate_generator = []
         if gate.generator is not None:
             gate_generator = list(inspect.signature(gate.generator).parameters.keys())
-        qubit_function_keys = ["target", "control", "qubit"]
+        qubit_function_keys = ["target", "control", "qubit", "qubit0", "qubit1"]
         if gate.is_anonymous:
             if "MatrixGate" in gate_name:
                 # In the case of a MatrixGate the newlines should be removed from the array

test/writer/test_writer.py

@@ -86,6 +86,22 @@ def test_measure() -> None:
     )
 
 
+def test_swap() -> None:
+    builder = CircuitBuilder(2, 2)
+    builder.SWAP(0, 1)
+    circuit = builder.to_circuit()
+    assert (
+        writer.circuit_to_string(circuit)
+        == """version 3.0
+
+qubit[2] q
+bit[2] b
+
+SWAP q[0], q[1]
+"""
+    )
+
+
 def test_anonymous_gate() -> None:
     builder = CircuitBuilder(2, 2)
     builder.H(0)