Create gates.CY

pyproject.toml

@@ -22,7 +22,7 @@ classifiers=[
 [tool.poetry.dependencies]
 python=">=3.8.0,<3.12"
 numba=">=0.51.0"
-qibo=">=0.2.2"
+qibo={ git = "https://github.com/qiboteam/qibo.git@controlled_y" }
 scipy = "^1.10.1"
 psutil = "^5.9.5"
 

src/qibojit/backends/cpu.py

@@ -13,6 +13,7 @@
     "TOFFOLI": "apply_x",
     "Y": "apply_y",
     "Z": "apply_z",
+    "CY": "apply_y",
     "CZ": "apply_z",
     "U1": "apply_z_pow",
     "CU1": "apply_z_pow",
@@ -176,7 +177,7 @@ def apply_gate(self, gate, state, nqubits):
 
     def apply_gate_density_matrix(self, gate, state, nqubits, inverse=False):
         name = gate.__class__.__name__
-        if name == "Y":
+        if name in ["Y", "CY"]:
             return self._apply_ygate_density_matrix(gate, state, nqubits)
         if inverse:
             # used to reset the state when applying channels

src/qibojit/backends/matrices.py

@@ -22,6 +22,10 @@ class CuQuantumMatrices(NumpyMatrices):
     def CNOT(self):
         return self.X
 
+    @cached_property
+    def CY(self):
+        return self.Y
+
     @cached_property
     def CZ(self):
         return self.Z

src/qibojit/tests/test_gates.py

@@ -156,6 +156,30 @@ def test_apply_two_qubit_base(backend, nqubits, targets, use_qubits, dtype):
     backend.assert_allclose(state, target_state, atol=ATOL.get(dtype))
 
 
+@pytest.mark.parametrize(
+    ("nqubits", "targets"),
+    [
+        (2, [0, 1]),
+        (3, [0, 2]),
+        (4, [1, 3]),
+        (3, [1, 2]),
+        (4, [0, 2]),
+        (4, [2, 3]),
+        (5, [3, 4]),
+        (6, [1, 4]),
+    ],
+)
+def test_apply_cy(backend, nqubits, targets, dtype):
+    tbackend = NumpyBackend()
+    state = random_statevector(2**nqubits, backend=tbackend).astype(dtype)
+    gate = gates.CY(*targets)
+
+    set_precision(dtype, backend, tbackend)
+    target_state = tbackend.apply_gate(gate, np.copy(state), nqubits)
+    state = backend.apply_gate(gate, np.copy(state), nqubits)
+    backend.assert_allclose(state, target_state, atol=ATOL.get(dtype))
+
+
 @pytest.mark.parametrize(
     ("nqubits", "targets"),
     [