diff --git a/cirq-core/cirq/__init__.py b/cirq-core/cirq/__init__.py
index eb776e5fd4f..c1f8cc14b95 100644
--- a/cirq-core/cirq/__init__.py
+++ b/cirq-core/cirq/__init__.py
@@ -95,7 +95,6 @@
     NoiseProperties,
     OpIdentifier,
     SuperconductingQubitsNoiseProperties,
-    SymmetricalQidPair,
     UNCONSTRAINED_DEVICE,
     NamedTopology,
     draw_gridlike,
diff --git a/cirq-core/cirq/contrib/graph_device/graph_device.py b/cirq-core/cirq/contrib/graph_device/graph_device.py
index acd26b724d9..02a642a092d 100644
--- a/cirq-core/cirq/contrib/graph_device/graph_device.py
+++ b/cirq-core/cirq/contrib/graph_device/graph_device.py
@@ -163,20 +163,6 @@ def qubit_set(self) -> FrozenSet['cirq.Qid']:
     def edges(self):
         return tuple(sorted(self.device_graph.edges))
 
-    @_compat.deprecated(
-        deadline='v0.15',
-        fix='qubit coupling data can now be found in device.metadata.nx_graph if provided.',
-    )
-    def qid_pairs(self) -> FrozenSet['cirq.SymmetricalQidPair']:
-        with _compat.block_overlapping_deprecation('device\\.metadata'):
-            return frozenset(
-                [
-                    devices.SymmetricalQidPair(*edge)  # type: ignore
-                    for edge in self.device_graph.edges
-                    if len(edge) == 2 and all(isinstance(q, ops.Qid) for q in edge)
-                ]
-            )
-
     @property
     def labelled_edges(self):
         return self.device_graph.labelled_edges
diff --git a/cirq-core/cirq/contrib/graph_device/graph_device_test.py b/cirq-core/cirq/contrib/graph_device/graph_device_test.py
index 169f779194d..b2b0eb304e1 100644
--- a/cirq-core/cirq/contrib/graph_device/graph_device_test.py
+++ b/cirq-core/cirq/contrib/graph_device/graph_device_test.py
@@ -181,11 +181,3 @@ def test_qubit_set_deprecated():
     device = ccgd.UndirectedGraphDevice(device_graph=device_graph)
     with cirq.testing.assert_deprecated('qubit_set', deadline='v0.15'):
         assert device.qubit_set() == {a, b, c, d}
-
-
-def test_qid_pairs_deprecated():
-    a, b, c, d = cirq.LineQubit.range(4)
-    device_graph = ccgd.UndirectedHypergraph(labelled_edges={(a, b): None, (c, d): None})
-    device = ccgd.UndirectedGraphDevice(device_graph=device_graph)
-    with cirq.testing.assert_deprecated('device.metadata', deadline='v0.15', count=1):
-        assert len(device.qid_pairs()) == 2
diff --git a/cirq-core/cirq/devices/__init__.py b/cirq-core/cirq/devices/__init__.py
index 61bebac9f9a..7ff622946a1 100644
--- a/cirq-core/cirq/devices/__init__.py
+++ b/cirq-core/cirq/devices/__init__.py
@@ -14,7 +14,7 @@
 
 """Device classes, qubits, and topologies, as well as noise models."""
 
-from cirq.devices.device import Device, DeviceMetadata, SymmetricalQidPair
+from cirq.devices.device import Device, DeviceMetadata
 
 from cirq.devices.grid_device_metadata import GridDeviceMetadata
 
diff --git a/cirq-core/cirq/devices/device.py b/cirq-core/cirq/devices/device.py
index 3f265a1e262..2e5079e5322 100644
--- a/cirq-core/cirq/devices/device.py
+++ b/cirq-core/cirq/devices/device.py
@@ -13,11 +13,9 @@
 # limitations under the License.
 
 import abc
-from typing import TYPE_CHECKING, Optional, AbstractSet, cast, FrozenSet, Iterator, Iterable
+from typing import TYPE_CHECKING, Optional, AbstractSet, FrozenSet, Iterable
 import networkx as nx
 from cirq import _compat, value
-from cirq.devices.grid_qubit import _BaseGridQid
-from cirq.devices.line_qubit import _BaseLineQid
 
 if TYPE_CHECKING:
     import cirq
@@ -51,47 +49,6 @@ def qubit_set(self) -> Optional[AbstractSet['cirq.Qid']]:
         # Default to the qubits being unknown.
         return None
 
-    @_compat.deprecated(
-        deadline='v0.15', fix='qubit coupling data can now be found in device.metadata if provided.'
-    )
-    def qid_pairs(self) -> Optional[FrozenSet['cirq.SymmetricalQidPair']]:
-        """Returns a set of qubit edges on the device, if possible.
-
-        This property can be overridden in child classes for special handling.
-        The default handling is: GridQids and LineQids will have neighbors as
-        edges, and others will be fully connected.
-
-        Returns:
-            If the device has a finite set of qubits, then a set of all edges
-            on the device is returned.
-
-            If the device has no well defined finite set of qubits (e.g.
-            `cirq.UnconstrainedDevice` has this property), then `None` is
-            returned.
-        """
-        with _compat.block_overlapping_deprecation('(device\\.metadata|qubit_set)'):
-            qs = self.qubit_set()
-            if qs is None:
-                return None
-            if all(isinstance(q, _BaseGridQid) for q in qs):
-                return frozenset(
-                    [
-                        SymmetricalQidPair(q, q2)
-                        for q in [cast(_BaseGridQid, q) for q in qs]
-                        for q2 in [q + (0, 1), q + (1, 0)]
-                        if q2 in qs
-                    ]
-                )
-            if all(isinstance(q, _BaseLineQid) for q in qs):
-                return frozenset(
-                    [
-                        SymmetricalQidPair(q, q + 1)
-                        for q in [cast(_BaseLineQid, q) for q in qs]
-                        if q + 1 in qs
-                    ]
-                )
-            return frozenset([SymmetricalQidPair(q, q2) for q in qs for q2 in qs if q < q2])
-
     @_compat.deprecated(deadline='v0.15', fix='Devices will no longer decompose operations.')
     def decompose_operation(self, operation: 'cirq.Operation') -> 'cirq.OP_TREE':
         """Returns a device-valid decomposition for the given operation.
@@ -168,40 +125,6 @@ def can_add_operation_into_moment(
         return not moment.operates_on(operation.qubits)
 
 
-@_compat.deprecated_class(
-    deadline='v0.15',
-    fix='Qid coupling information can now be found in device.metadata if applicable.',
-)
-@value.value_equality
-class SymmetricalQidPair:
-    def __init__(self, qid1: 'cirq.Qid', qid2: 'cirq.Qid'):
-        if qid1 == qid2:
-            raise ValueError('A QidPair cannot have identical qids.')
-        self.qids = frozenset([qid1, qid2])
-
-    def _value_equality_values_(self):
-        return self.qids
-
-    def __repr__(self):
-        return f'cirq.QidPair({repr(sorted(self.qids))[1:-1]})'
-
-    def _json_dict_(self):
-        return {'qids': sorted(self.qids)}
-
-    @classmethod
-    def _from_json_dict_(cls, qids, **kwargs):
-        return cls(qids[0], qids[1])
-
-    def __len__(self) -> int:
-        return 2
-
-    def __iter__(self) -> Iterator['cirq.Qid']:
-        yield from sorted(self.qids)
-
-    def __contains__(self, item: 'cirq.Qid') -> bool:
-        return item in self.qids
-
-
 @value.value_equality
 class DeviceMetadata:
     """Parent type for all device specific metadata classes."""
diff --git a/cirq-core/cirq/devices/device_test.py b/cirq-core/cirq/devices/device_test.py
index 0bba3f991ec..e7a8b4c9395 100644
--- a/cirq-core/cirq/devices/device_test.py
+++ b/cirq-core/cirq/devices/device_test.py
@@ -1,5 +1,4 @@
 # pylint: disable=wrong-or-nonexistent-copyright-notice
-import pytest
 import networkx as nx
 import cirq
 
@@ -40,24 +39,6 @@ def _qubits(self):
         assert PrivateQubitMethodDevice().qubit_set() == frozenset(cirq.LineQubit.range(6))
 
 
-def test_qid_pairs():
-    class RawDevice(cirq.Device):
-        pass
-
-    with cirq.testing.assert_deprecated('device.metadata', deadline='v0.15', count=1):
-        assert RawDevice().qid_pairs() is None
-
-    class QubitFieldDevice(cirq.Device):
-        def __init__(self, qubits):
-            self.qubits = qubits
-
-    with cirq.testing.assert_deprecated('device.metadata', deadline='v0.15', count=3):
-
-        assert len(QubitFieldDevice(cirq.LineQubit.range(10)).qid_pairs()) == 9
-        assert len(QubitFieldDevice(cirq.GridQubit.rect(10, 10)).qid_pairs()) == 180
-        assert len(QubitFieldDevice([cirq.NamedQubit(str(s)) for s in range(10)]).qid_pairs()) == 45
-
-
 def test_decompose_operation_deprecated():
     q0 = cirq.GridQubit(0, 0)
 
@@ -68,36 +49,6 @@ class RawDevice(cirq.Device):
         RawDevice().decompose_operation(cirq.H(q0))
 
 
-def test_qid_pair_deprecated():
-    q0, q1, q2, q3 = cirq.LineQubit.range(4)
-    with cirq.testing.assert_deprecated('device.metadata', deadline='v0.15', count=3):
-        e1 = cirq.SymmetricalQidPair(q0, q1)
-        e2 = cirq.SymmetricalQidPair(q1, q0)
-        e3 = cirq.SymmetricalQidPair(q2, q3)
-    assert e1 == e2
-    assert e2 != e3
-    assert repr(e1) == "cirq.QidPair(cirq.LineQubit(0), cirq.LineQubit(1))"
-
-    assert len(e1) == 2
-    a, b = e1
-    assert (a, b) == (q0, q1)
-    a, b = e2
-    assert (a, b) == (q0, q1)
-
-    assert q0 in e1
-    assert q1 in e1
-    assert q2 not in e1
-
-    set1 = frozenset([e1, e2])
-    set2 = frozenset([e2, e3])
-    assert len(set1) == 1
-    assert len(set2) == 2
-
-    with cirq.testing.assert_deprecated('device.metadata', deadline='v0.15', count=1):
-        with pytest.raises(ValueError, match='A QidPair cannot have identical qids.'):
-            cirq.SymmetricalQidPair(q0, q0)
-
-
 def test_device_metadata():
     class RawDevice(cirq.Device):
         pass
diff --git a/cirq-core/cirq/ion/ion_device.py b/cirq-core/cirq/ion/ion_device.py
index f43320019e0..e767066cabf 100644
--- a/cirq-core/cirq/ion/ion_device.py
+++ b/cirq-core/cirq/ion/ion_device.py
@@ -82,19 +82,6 @@ def metadata(self) -> devices.DeviceMetadata:
     def qubit_set(self) -> FrozenSet['cirq.LineQubit']:
         return self.qubits
 
-    @_compat.deprecated(
-        deadline='v0.15', fix='qubit coupling data can now be found in device.metadata if provided.'
-    )
-    def qid_pairs(self) -> FrozenSet['cirq.SymmetricalQidPair']:
-        """Qubits have all-to-all connectivity, so returns all pairs.
-
-        Returns:
-            All qubit pairs on the device.
-        """
-        with _compat.block_overlapping_deprecation('device\\.metadata'):
-            qs = self.qubits
-            return frozenset([devices.SymmetricalQidPair(q, q2) for q in qs for q2 in qs if q < q2])
-
     @_compat.deprecated(
         fix='Use cirq.ConvertToIonGates() instead to decompose operations.', deadline='v0.15'
     )
diff --git a/cirq-core/cirq/ion/ion_device_test.py b/cirq-core/cirq/ion/ion_device_test.py
index 24f9e8a1b7e..405d3540689 100644
--- a/cirq-core/cirq/ion/ion_device_test.py
+++ b/cirq-core/cirq/ion/ion_device_test.py
@@ -220,8 +220,3 @@ def test_at():
 def test_qubit_set_deprecated():
     with cirq.testing.assert_deprecated('qubit_set', deadline='v0.15', count=2):
         assert ion_device(3).qubit_set() == frozenset(cirq.LineQubit.range(3))
-
-
-def test_qid_pairs_deprecated():
-    with cirq.testing.assert_deprecated('device.metadata', deadline='v0.15', count=2):
-        assert len(ion_device(10).qid_pairs()) == 45
diff --git a/cirq-core/cirq/json_resolver_cache.py b/cirq-core/cirq/json_resolver_cache.py
index 656eb3fbebc..c4a6765c764 100644
--- a/cirq-core/cirq/json_resolver_cache.py
+++ b/cirq-core/cirq/json_resolver_cache.py
@@ -64,6 +64,9 @@ def _datetime(timestamp: float) -> datetime.datetime:
         # timezones, and hour fields will not be identical.
         return datetime.datetime.fromtimestamp(timestamp, tz=datetime.timezone.utc)
 
+    def _symmetricalqidpair(qids):
+        return frozenset(qids)
+
     import sympy
 
     return {
@@ -176,7 +179,6 @@ def _datetime(timestamp: float) -> datetime.datetime:
         'StabilizerStateChForm': cirq.StabilizerStateChForm,
         'StatePreparationChannel': cirq.StatePreparationChannel,
         'SwapPowGate': cirq.SwapPowGate,
-        'SymmetricalQidPair': cirq.SymmetricalQidPair,
         'SympyCondition': cirq.SympyCondition,
         'TaggedOperation': cirq.TaggedOperation,
         'TiltedSquareLattice': cirq.TiltedSquareLattice,
@@ -204,6 +206,7 @@ def _datetime(timestamp: float) -> datetime.datetime:
         'IdentityOperation': _identity_operation_from_dict,
         'ParallelGateOperation': _parallel_gate_op,  # Removed in v0.14
         'SingleQubitMatrixGate': single_qubit_matrix_gate,
+        'SymmetricalQidPair': _symmetricalqidpair,  # Removed in v0.15
         'TwoQubitMatrixGate': two_qubit_matrix_gate,
         # not a cirq class, but treated as one:
         'pandas.DataFrame': pd.DataFrame,
diff --git a/cirq-core/cirq/protocols/json_test_data/SymmetricalQidPair.json b/cirq-core/cirq/protocols/json_test_data/SymmetricalQidPair.json_inward
similarity index 100%
rename from cirq-core/cirq/protocols/json_test_data/SymmetricalQidPair.json
rename to cirq-core/cirq/protocols/json_test_data/SymmetricalQidPair.json_inward
diff --git a/cirq-core/cirq/protocols/json_test_data/SymmetricalQidPair.repr b/cirq-core/cirq/protocols/json_test_data/SymmetricalQidPair.repr
deleted file mode 100644
index 987b1359682..00000000000
--- a/cirq-core/cirq/protocols/json_test_data/SymmetricalQidPair.repr
+++ /dev/null
@@ -1 +0,0 @@
-cirq.SymmetricalQidPair(cirq.LineQubit(0), cirq.LineQubit(1))
\ No newline at end of file
diff --git a/cirq-core/cirq/protocols/json_test_data/SymmetricalQidPair.repr_inward b/cirq-core/cirq/protocols/json_test_data/SymmetricalQidPair.repr_inward
new file mode 100644
index 00000000000..07e21270702
--- /dev/null
+++ b/cirq-core/cirq/protocols/json_test_data/SymmetricalQidPair.repr_inward
@@ -0,0 +1 @@
+frozenset([cirq.LineQubit(0), cirq.LineQubit(1)])
\ No newline at end of file
diff --git a/cirq-core/cirq/protocols/json_test_data/spec.py b/cirq-core/cirq/protocols/json_test_data/spec.py
index 434a12c5e6c..ba93126fb14 100644
--- a/cirq-core/cirq/protocols/json_test_data/spec.py
+++ b/cirq-core/cirq/protocols/json_test_data/spec.py
@@ -199,7 +199,7 @@
         'Unique',
         'DEFAULT_RESOLVERS',
     ],
-    deprecated={'GlobalPhaseOperation': 'v0.16', 'SymmetricalQidPair': 'v0.15'},
+    deprecated={'GlobalPhaseOperation': 'v0.16'},
     tested_elsewhere=[
         # SerializableByKey does not follow common serialization rules.
         # It is tested separately in test_context_serialization.
diff --git a/cirq-google/cirq_google/devices/serializable_device.py b/cirq-google/cirq_google/devices/serializable_device.py
index 6f5aad70c36..7a950bd1bb3 100644
--- a/cirq-google/cirq_google/devices/serializable_device.py
+++ b/cirq-google/cirq_google/devices/serializable_device.py
@@ -250,28 +250,6 @@ def __str__(self) -> str:
 
         return super().__str__()
 
-    @_compat.deprecated(
-        deadline='v0.15', fix='qubit coupling data can now be found in device.metadata if provided.'
-    )
-    def qid_pairs(self) -> FrozenSet['cirq.SymmetricalQidPair']:
-        """Returns a list of qubit edges on the device, defined by the gate
-        definitions.
-
-        Returns:
-            The list of qubit edges on the device.
-        """
-        with _compat.block_overlapping_deprecation('device\\.metadata'):
-            return frozenset(
-                [
-                    cirq.SymmetricalQidPair(pair[0], pair[1])
-                    for gate_defs in self.gate_definitions.values()
-                    for gate_def in gate_defs
-                    if gate_def.number_of_qubits == 2
-                    for pair in gate_def.target_set
-                    if len(pair) == 2 and pair[0] < pair[1]
-                ]
-            )
-
     def _repr_pretty_(self, p: Any, cycle: bool) -> None:
         """Creates ASCII diagram for Jupyter, IPython, etc."""
         # There should never be a cycle, but just in case use the default repr.
diff --git a/cirq-google/cirq_google/devices/serializable_device_test.py b/cirq-google/cirq_google/devices/serializable_device_test.py
index a395137a971..90001631189 100644
--- a/cirq-google/cirq_google/devices/serializable_device_test.py
+++ b/cirq-google/cirq_google/devices/serializable_device_test.py
@@ -471,8 +471,3 @@ def test_sycamore23_str():
                                     │
                                     (9, 4)"""
     )
-
-
-def test_sycamore23_qid_pairs_deprecated():
-    with cirq.testing.assert_deprecated('device.metadata', deadline='v0.15', count=1):
-        assert len(cg.Sycamore23.qid_pairs()) == 32
diff --git a/cirq-pasqal/cirq_pasqal/pasqal_device.py b/cirq-pasqal/cirq_pasqal/pasqal_device.py
index 58013a68ae7..bc80799a5b9 100644
--- a/cirq-pasqal/cirq_pasqal/pasqal_device.py
+++ b/cirq-pasqal/cirq_pasqal/pasqal_device.py
@@ -356,26 +356,6 @@ def _value_equality_values_(self) -> Any:
     def _json_dict_(self) -> Dict[str, Any]:
         return cirq.protocols.obj_to_dict_helper(self, ['control_radius', 'qubits'])
 
-    @_compat.deprecated(
-        deadline='v0.15', fix='qubit coupling data can now be found in device.metadata if provided.'
-    )
-    def qid_pairs(self) -> FrozenSet['cirq.SymmetricalQidPair']:
-        """Returns a list of qubit edges on the device.
-
-        Returns:
-            All qubit pairs that are less or equal to the control radius apart.
-        """
-        with _compat.block_overlapping_deprecation('device\\.metadata'):
-            qs = self.qubits
-            return frozenset(
-                [
-                    cirq.SymmetricalQidPair(q, q2)
-                    for q in qs
-                    for q2 in qs
-                    if q < q2 and self.distance(q, q2) <= self.control_radius
-                ]
-            )
-
 
 class PasqalConverter(cirq.neutral_atoms.ConvertToNeutralAtomGates):
     """A gate converter for compatibility with Pasqal processors.
diff --git a/cirq-pasqal/cirq_pasqal/pasqal_device_test.py b/cirq-pasqal/cirq_pasqal/pasqal_device_test.py
index 3d9b3e60077..ab594b6a855 100644
--- a/cirq-pasqal/cirq_pasqal/pasqal_device_test.py
+++ b/cirq-pasqal/cirq_pasqal/pasqal_device_test.py
@@ -258,22 +258,3 @@ def test_to_json():
     vdev = PasqalVirtualDevice(control_radius=2, qubits=[TwoDQubit(0, 0)])
     d = vdev._json_dict_()
     assert d == {"control_radius": 2, "qubits": [cirq_pasqal.TwoDQubit(0, 0)]}
-
-
-def test_qid_pairs_deprecated():
-    dev = PasqalVirtualDevice(
-        1,
-        qubits=[
-            ThreeDQubit(0, 0, 0),
-            ThreeDQubit(1, 0, 0),
-            ThreeDQubit(0, 1, 0),
-            ThreeDQubit(1, 1, 0),
-            ThreeDQubit(1, 1, 1),
-        ],
-    )
-    with cirq.testing.assert_deprecated('device.metadata', deadline='v0.15', count=3):
-        assert len(dev.qid_pairs()) == 5
-        dev1 = PasqalVirtualDevice(
-            5, qubits=[TwoDQubit(0, 0), TwoDQubit(3, 2), TwoDQubit(3, 4), TwoDQubit(3, 6)]
-        )
-        assert len(dev1.qid_pairs()) == 5