Fix bug in writer for SWAP instruction. (#444)

* Fix bug in writer for SWAP instruction. * Add CHANGELOG entry. Update OpenSquirrel version number. * Update CHANGELOG.md Co-authored-by: Roberto Turrado Camblor <[email protected]> * Undo version number update (not part of this bugfix). * Update CHANGELOG.md Co-authored-by: Roberto Turrado Camblor <[email protected]> --------- Co-authored-by: Roberto Turrado Camblor <[email protected]>
QuTech-Delft · Jan 31, 2025 · 07e1ee2 · 07e1ee2
1 parent 42691cb
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -10,6 +10,13 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 * **Removed** for now removed features.
 
 
+## [0.4.0] - [ xxxx-yy-zz ]
+
+### Fixed
+
+- Bug in the writing of SWAP instructions
+
+
 ## [ 0.3.0 ] - [ 2025-01-30 ]
 
 ### Added

diff --git a/opensquirrel/writer/writer.py b/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

diff --git a/test/writer/test_writer.py b/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)