Remove deprecated netural_atoms classes (quantumlib#5695)

- Removes NeutralAtomDevice and ConvertToNeutralAtomGates

cirq-core/cirq/__init__.py

@@ -654,12 +654,7 @@
 )
 
 from cirq.ion import ConvertToIonGates, IonDevice
-from cirq.neutral_atoms import (
-    ConvertToNeutralAtomGates,
-    is_native_neutral_atom_gate,
-    is_native_neutral_atom_op,
-    NeutralAtomDevice,
-)
+from cirq.neutral_atoms import is_native_neutral_atom_gate, is_native_neutral_atom_op
 
 from cirq.vis import (
     Heatmap,

cirq-core/cirq/neutral_atoms/__init__.py

@@ -14,10 +14,7 @@
 
 """Neutral atom devices and gates."""
 
-from cirq.neutral_atoms.neutral_atom_devices import NeutralAtomDevice
-
 from cirq.neutral_atoms.convert_to_neutral_atom_gates import (
-    ConvertToNeutralAtomGates,
     is_native_neutral_atom_gate,
     is_native_neutral_atom_op,
 )

cirq-core/cirq/neutral_atoms/convert_to_neutral_atom_gates.py

@@ -11,88 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from typing import List, Optional, TYPE_CHECKING
 
-from cirq import ops, protocols, transformers
-from cirq._compat import deprecated_class
-from cirq.circuits.optimization_pass import PointOptimizationSummary, PointOptimizer
+from cirq import ops
 from cirq.neutral_atoms import neutral_atom_devices
 
-if TYPE_CHECKING:
-    import cirq
-
-
-@deprecated_class(
-    deadline='v0.16',
-    fix='Use cirq.optimize_for_target_gateset(circuit, gateset=cirq_pasqal.PasqalGateset()).',
-)
-class ConvertToNeutralAtomGates(PointOptimizer):
-    """Attempts to convert gates into native Atom gates.
-
-    First, checks if the given operation is already a native neutral atom
-    operation.
-
-    Second, checks if the operation has a known unitary. If so, and the gate
-        is a 1-qubit or 2-qubit gate, then performs circuit synthesis of the
-        operation. The 2-qubit gates are decomposed using CZ gates because
-        CZ gates are the highest fidelity 2-qubit gates for neutral atoms.
-
-    Third, attempts to `cirq.decompose` to the operation.
-
-    Fourth, if ignore_failures is set, gives up and returns the gate unchanged.
-        Otherwise raises a TypeError.
-    """
-
-    def __init__(self, ignore_failures=False) -> None:
-        """Inits ConvertToNeutralAtomGates.
-
-        Args:
-            ignore_failures: If set, gates that fail to convert are forwarded
-                unchanged. If not set, conversion failures raise a TypeError.
-        """
-        super().__init__()
-        self.ignore_failures = ignore_failures
-        self.gateset = neutral_atom_devices.neutral_atom_gateset()
-
-    def _convert_one(self, op: ops.Operation) -> ops.OP_TREE:
-        # Known matrix?
-        mat = protocols.unitary(op, None) if len(op.qubits) <= 2 else None
-        if mat is not None and len(op.qubits) == 1:
-            gates = transformers.single_qubit_matrix_to_phased_x_z(mat)
-            return [g.on(op.qubits[0]) for g in gates]
-        if mat is not None and len(op.qubits) == 2:
-            return transformers.two_qubit_matrix_to_cz_operations(
-                op.qubits[0], op.qubits[1], mat, allow_partial_czs=False, clean_operations=True
-            )
-
-        return NotImplemented
-
-    def convert(self, op: ops.Operation) -> List[ops.Operation]:
-        def on_stuck_raise(bad):
-            return TypeError(
-                "Don't know how to work with {!r}. "
-                "It isn't a native atom operation, "
-                "a 1 or 2 qubit gate with a known unitary, "
-                "or composite.".format(bad)
-            )
-
-        return protocols.decompose(
-            op,
-            keep=self.gateset._validate_operation,
-            intercepting_decomposer=self._convert_one,
-            on_stuck_raise=None if self.ignore_failures else on_stuck_raise,
-        )
-
-    def optimization_at(
-        self, circuit: 'cirq.Circuit', index: int, op: 'cirq.Operation'
-    ) -> Optional['cirq.PointOptimizationSummary']:
-        converted = self.convert(op)
-        if len(converted) == 1 and converted[0] is op:
-            return None
-        return PointOptimizationSummary(
-            clear_span=1, new_operations=converted, clear_qubits=op.qubits
-        )
-
 
 def is_native_neutral_atom_op(operation: ops.Operation) -> bool:
     """Returns true if the operation is in the default neutral atom gateset."""

cirq-core/cirq/neutral_atoms/convert_to_neutral_atom_gates_test.py

@@ -12,81 +12,39 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import numpy as np
 import pytest
 
 import cirq
 
 
-Q = cirq.LineQubit.range(3)
-
-
-def test_coverage():
-    with cirq.testing.assert_deprecated(
-        "Use cirq.optimize_for_target_gateset", deadline='v0.16', count=3
-    ):
-        q = cirq.LineQubit.range(3)
-        g = cirq.testing.ThreeQubitGate()
-
-        class FakeOperation(cirq.Operation):
-            def __init__(self, gate, qubits):
-                self._gate = gate
-                self._qubits = qubits
-
-            @property
-            def qubits(self):
-                return self._qubits
-
-            def with_qubits(self, *new_qubits):
-                return FakeOperation(self._gate, new_qubits)
-
-        op = FakeOperation(g, q).with_qubits(*q)
-        circuit_ops = [cirq.Y(q[0]), cirq.ParallelGate(cirq.X, 3).on(*q)]
-        c = cirq.Circuit(circuit_ops)
-        cirq.neutral_atoms.ConvertToNeutralAtomGates().optimize_circuit(c)
-        assert c == cirq.Circuit(circuit_ops)
-        assert cirq.neutral_atoms.ConvertToNeutralAtomGates().convert(cirq.X.on(q[0])) == [
-            cirq.X.on(q[0])
-        ]
-        with pytest.raises(TypeError, match="Don't know how to work with"):
-            cirq.neutral_atoms.ConvertToNeutralAtomGates().convert(op)
-        assert not cirq.neutral_atoms.is_native_neutral_atom_op(op)
-        assert not cirq.neutral_atoms.is_native_neutral_atom_gate(g)
-
-
-def test_avoids_decompose_fallback_when_matrix_available_single_qubit():
-    class OtherX(cirq.testing.SingleQubitGate):
-        def _unitary_(self) -> np.ndarray:
-            return np.array([[0, 1], [1, 0]])
-
-    class OtherOtherX(cirq.testing.SingleQubitGate):
-        def _decompose_(self, qubits):
-            return OtherX().on(*qubits)
-
-    q = cirq.GridQubit(0, 0)
-    c = cirq.Circuit(OtherX().on(q), OtherOtherX().on(q))
-    with cirq.testing.assert_deprecated("Use cirq.optimize_for_target_gateset", deadline='v0.16'):
-        cirq.neutral_atoms.ConvertToNeutralAtomGates().optimize_circuit(c)
-        cirq.testing.assert_has_diagram(c, '(0, 0): ───PhX(1)───PhX(1)───')
-
-
-def test_avoids_decompose_fallback_when_matrix_available_two_qubit():
-    class OtherCZ(cirq.testing.TwoQubitGate):
-        def _unitary_(self) -> np.ndarray:
-            return np.array([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, -1]])
-
-    class OtherOtherCZ(cirq.testing.TwoQubitGate):
-        def _decompose_(self, qubits):
-            return OtherCZ().on(*qubits)
-
-    q00 = cirq.GridQubit(0, 0)
-    q01 = cirq.GridQubit(0, 1)
-    c = cirq.Circuit(OtherCZ().on(q00, q01), OtherOtherCZ().on(q00, q01))
-    expected_diagram = """
-(0, 0): ───@───@───
-           │   │
-(0, 1): ───@───@───
-"""
-    with cirq.testing.assert_deprecated("Use cirq.optimize_for_target_gateset", deadline='v0.16'):
-        cirq.neutral_atoms.ConvertToNeutralAtomGates().optimize_circuit(c)
-        cirq.testing.assert_has_diagram(c, expected_diagram)
+Q, Q2, Q3 = cirq.LineQubit.range(3)
+
+
+@pytest.mark.parametrize(
+    "op,expected",
+    [
+        (cirq.H(Q), False),
+        (cirq.HPowGate(exponent=0.5)(Q), False),
+        (cirq.PhasedXPowGate(exponent=0.25, phase_exponent=0.125)(Q), True),
+        (cirq.XPowGate(exponent=0.5)(Q), True),
+        (cirq.YPowGate(exponent=0.25)(Q), True),
+        (cirq.ZPowGate(exponent=0.125)(Q), True),
+        (cirq.CZPowGate(exponent=0.5)(Q, Q2), False),
+        (cirq.CZ(Q, Q2), True),
+        (cirq.CNOT(Q, Q2), True),
+        (cirq.SWAP(Q, Q2), False),
+        (cirq.ISWAP(Q, Q2), False),
+        (cirq.CCNOT(Q, Q2, Q3), True),
+        (cirq.CCZ(Q, Q2, Q3), True),
+        (cirq.ParallelGate(cirq.X, num_copies=3)(Q, Q2, Q3), True),
+        (cirq.ParallelGate(cirq.Y, num_copies=3)(Q, Q2, Q3), True),
+        (cirq.ParallelGate(cirq.Z, num_copies=3)(Q, Q2, Q3), True),
+        (cirq.X(Q).controlled_by(Q2, Q3), True),
+        (cirq.Z(Q).controlled_by(Q2, Q3), True),
+        (cirq.ZPowGate(exponent=0.5)(Q).controlled_by(Q2, Q3), False),
+    ],
+)
+def test_gateset(op: cirq.Operation, expected: bool):
+    assert cirq.is_native_neutral_atom_op(op) == expected
+    if op.gate is not None:
+        assert cirq.is_native_neutral_atom_gate(op.gate) == expected