Increate test tolerances on some analytical decomposition tests (quantumlib#5535)

Author: maffoo

cirq-core/cirq/transformers/analytical_decompositions/two_qubit_to_cz_test.py

@@ -265,4 +265,4 @@ def test_decompose_to_diagonal_and_circuit(v):
     assert cirq.is_diagonal(diagonal)
     combined_circuit = cirq.Circuit(cirq.MatrixGate(diagonal)(b, c), ops)
     circuit_unitary = combined_circuit.unitary(qubits_that_should_be_present=[b, c])
-    cirq.testing.assert_allclose_up_to_global_phase(circuit_unitary, v, atol=2e-6)
+    cirq.testing.assert_allclose_up_to_global_phase(circuit_unitary, v, atol=1e-5)

cirq-core/cirq/transformers/analytical_decompositions/two_qubit_to_fsim_test.py

@@ -84,7 +84,7 @@ def test_decompose_two_qubit_interaction_into_two_b_gates(obj: Any):
     for operation in circuit.all_operations():
         assert len(operation.qubits) < 2 or operation.gate == _B
     # We lose a lot of precision in the random 4 qubit gates, so this atol is higher.
-    np.testing.assert_allclose(cirq.unitary(circuit), desired_unitary, atol=3e-5)
+    np.testing.assert_allclose(cirq.unitary(circuit), desired_unitary, atol=1e-4)
 
 
 def test_decompose_xx_yy_into_two_fsims_ignoring_single_qubit_ops_fail():
@@ -117,7 +117,7 @@ def test_decompose_two_qubit_interaction_into_four_fsim_gates_equivalence(
     for operation in circuit.all_operations():
         assert len(operation.qubits) < 2 or operation.gate == fsim_gate
     assert len(circuit) <= 4 * 3 + 5
-    assert cirq.approx_eq(circuit.unitary(qubit_order=qubits), desired_unitary, atol=1e-4)
+    assert cirq.approx_eq(circuit.unitary(qubit_order=qubits), desired_unitary, atol=2e-4)
 
 
 def test_decompose_two_qubit_interaction_into_four_fsim_gates_validate():