Flush v0.14.0 deprecation backlog. (#4601)

Removed `cirq.<vendor>` to `cirq_<vendor>` deprecations (This required some repr_inward changes as well as some renaming in `cirq_pasqal`). 
Removed `ParallelGateOperation`.
Removed `cirq.Two/ThreeQubitGate`. We still have `cirq.testing.Two/ThreeQubitGate`.
Removed `SupportsOnEachGate`.
Removed `allow_decompose` parameter from `measurement_key_names` and `is_measurement`.
Removed `kraus_to_channel_matrix`, `operation_to_channel_matrix`.
Removed `asynchronous_pending` and `cirq-core/cirq/testing/asynchronous.py`.
Removed `gate_set_name` in favor of `name` from `serializable_gate_set.py`

@mpharrigan can you double check my changes on the json items.

BREAKING CHANGE= some features of ParallelGateOperation aren't fully convertible. i.e. `cirq.num_qubits(old_op.gate) != cirq.num_qubits(new_op.gate)` and `isinstance(old_op, GateOperation) != isinstance(new_op, GateOperation)`

Author: MichaelBroughton

cirq-core/cirq/__init__.py

@@ -21,7 +21,6 @@
 from cirq import (
     # Low level
     _version,
-    _compat,
     _doc,
     type_workarounds,
 )
@@ -249,7 +248,6 @@
     ParallelGate,
     ParallelGateFamily,
     parallel_gate_op,
-    ParallelGateOperation,
     Pauli,
     PAULI_GATE_LIKE,
     PAULI_STRING_LIKE,
@@ -301,12 +299,10 @@
     SwapPowGate,
     T,
     TaggedOperation,
-    ThreeQubitGate,
     ThreeQubitDiagonalGate,
     TOFFOLI,
     transform_op_tree,
     TwoQubitDiagonalGate,
-    TwoQubitGate,
     VirtualTag,
     wait,
     WaitGate,
@@ -369,11 +365,9 @@
     entanglement_fidelity,
     eye_tensor,
     fidelity,
-    kraus_to_channel_matrix,
     kraus_to_choi,
     kraus_to_superoperator,
     one_hot,
-    operation_to_channel_matrix,
     operation_to_choi,
     operation_to_superoperator,
     QUANTUM_STATE_LIKE,
@@ -621,40 +615,6 @@
     testing,
 )
 
-_compat.deprecated_submodule(
-    new_module_name='cirq_google',
-    old_parent=__name__,
-    old_child='google',
-    deadline="v0.14",
-    create_attribute=True,
-)
-
-_compat.deprecated_submodule(
-    new_module_name='cirq_aqt',
-    old_parent=__name__,
-    old_child='aqt',
-    deadline="v0.14",
-    create_attribute=True,
-)
-
-
-_compat.deprecated_submodule(
-    new_module_name='cirq_ionq',
-    old_parent=__name__,
-    old_child='ionq',
-    deadline="v0.14",
-    create_attribute=True,
-)
-
-_compat.deprecated_submodule(
-    new_module_name='cirq_pasqal',
-    old_parent=__name__,
-    old_child='pasqal',
-    deadline="v0.14",
-    create_attribute=True,
-)
-
-
 # Registers cirq-core's public classes for JSON serialization.
 # pylint: disable=wrong-import-position
 from cirq.protocols.json_serialization import _register_resolver

cirq-core/cirq/json_resolver_cache.py

@@ -45,6 +45,9 @@ def two_qubit_matrix_gate(matrix):
             matrix = np.array(matrix, dtype=np.complex128)
         return cirq.MatrixGate(matrix, qid_shape=(2, 2))
 
+    def _parallel_gate_op(gate, qubits):
+        return cirq.parallel_gate_op(gate, *qubits)
+
     import sympy
 
     return {
@@ -112,7 +115,7 @@ def two_qubit_matrix_gate(matrix):
         '_PauliY': cirq.ops.pauli_gates._PauliY,
         '_PauliZ': cirq.ops.pauli_gates._PauliZ,
         'ParamResolver': cirq.ParamResolver,
-        'ParallelGateOperation': cirq.ParallelGateOperation,
+        'ParallelGateOperation': _parallel_gate_op,  # Removed in v0.14
         'ParallelGate': cirq.ParallelGate,
         'PauliMeasurementGate': cirq.PauliMeasurementGate,
         'PauliString': cirq.PauliString,

cirq-core/cirq/neutral_atoms/neutral_atom_devices.py

@@ -139,7 +139,7 @@ def duration_of(self, operation: ops.Operation):
                 gate
         """
         self.validate_operation(operation)
-        if isinstance(operation, (ops.GateOperation, ops.ParallelGateOperation)):
+        if isinstance(operation, ops.GateOperation):
             if isinstance(operation.gate, ops.MeasurementGate):
                 return self._measurement_duration
         return self._gate_duration
@@ -167,7 +167,7 @@ def validate_operation(self, operation: ops.Operation):
         Raises:
             ValueError: If the operation is not valid
         """
-        if not isinstance(operation, (ops.GateOperation, ops.ParallelGateOperation)):
+        if not isinstance(operation, ops.GateOperation):
             raise ValueError(f'Unsupported operation: {operation!r}')
 
         # All qubits the operation acts on must be on the device
@@ -219,7 +219,7 @@ def validate_moment(self, moment: ops.Moment):
 
         categorized_ops: DefaultDict = collections.defaultdict(list)
         for op in moment.operations:
-            assert isinstance(op, (ops.GateOperation, ops.ParallelGateOperation))
+            assert isinstance(op, ops.GateOperation)
             for k, v in CATEGORIES.items():
                 assert isinstance(v, tuple)
                 gate = _subgate_if_parallel_gate(op.gate)

cirq-core/cirq/ops/__init__.py

@@ -108,8 +108,6 @@
 from cirq.ops.gate_features import (
     InterchangeableQubitsGate,
     SingleQubitGate,
-    ThreeQubitGate,
-    TwoQubitGate,
 )
 
 from cirq.ops.gate_operation import (
@@ -154,10 +152,6 @@
 
 from cirq.ops.parallel_gate import ParallelGate, parallel_gate_op
 
-from cirq.ops.parallel_gate_operation import (
-    ParallelGateOperation,
-)
-
 from cirq.ops.projector import (
     ProjectorString,
 )

cirq-core/cirq/ops/gate_features.py

@@ -18,10 +18,7 @@
 """
 
 import abc
-import warnings
 
-from cirq import value, ops
-from cirq._compat import deprecated_class
 from cirq.ops import raw_types
 
 
@@ -33,58 +30,8 @@ def qubit_index_to_equivalence_group_key(self, index: int) -> int:
         return 0
 
 
-class _SupportsOnEachGateMeta(value.ABCMetaImplementAnyOneOf):
-    def __instancecheck__(cls, instance):
-        return isinstance(instance, (SingleQubitGate, ops.DepolarizingChannel)) or issubclass(
-            type(instance), SupportsOnEachGate
-        )
-
-
-@deprecated_class(
-    deadline='v0.14',
-    fix='Remove `SupportsOnEachGate` from the list of parent classes. '
-    '`on_each` is now directly supported in the `Gate` base class.',
-)
-class SupportsOnEachGate(raw_types.Gate, metaclass=_SupportsOnEachGateMeta):
-    pass
-
-
 class SingleQubitGate(raw_types.Gate, metaclass=abc.ABCMeta):
     """A gate that must be applied to exactly one qubit."""
 
     def _num_qubits_(self) -> int:
         return 1
-
-
-class _TwoQubitGateMeta(value.ABCMetaImplementAnyOneOf):
-    def __instancecheck__(cls, instance):
-        warnings.warn(
-            'isinstance(gate, TwoQubitGate) is deprecated. Use cirq.num_qubits(gate) == 2 instead',
-            DeprecationWarning,
-        )
-        return isinstance(instance, raw_types.Gate) and instance._num_qubits_() == 2
-
-
-@deprecated_class(deadline='v0.14', fix='Define _num_qubits_ manually.')
-class TwoQubitGate(raw_types.Gate, metaclass=_TwoQubitGateMeta):
-    """A gate that must be applied to exactly two qubits."""
-
-    def _num_qubits_(self) -> int:
-        return 2
-
-
-class _ThreeQubitGateMeta(value.ABCMetaImplementAnyOneOf):
-    def __instancecheck__(cls, instance):
-        warnings.warn(
-            'isinstance(gate, TwoQubitGate) is deprecated. Use cirq.num_qubits(gate) == 3 instead',
-            DeprecationWarning,
-        )
-        return isinstance(instance, raw_types.Gate) and instance._num_qubits_() == 3
-
-
-@deprecated_class(deadline='v0.14', fix='Define _num_qubits_ manually.')
-class ThreeQubitGate(raw_types.Gate, metaclass=_ThreeQubitGateMeta):
-    """A gate that must be applied to exactly three qubits."""
-
-    def _num_qubits_(self) -> int:
-        return 3