fix(remote): Block non QuantumCircuit experiments

qiskit_alice_bob_provider/remote/backend.py

@@ -100,6 +100,14 @@ def run(self, run_input: QuantumCircuit, **kwargs) -> AliceBobRemoteJob:
                 Wait for the results by calling
                 :func:`AliceBobRemoteJob.result`.
         """
+        if not isinstance(run_input, QuantumCircuit):
+            # Qiskit's execute() allows also for list[QuantumCircuit],
+            # Schedule and list[Schedule] as inputs. These types of experiments
+            # are not yet handled by the provider.
+            raise NotImplementedError(
+                'Experiments input not supported by the Alice & Bob provider. '
+                'Please provide an instance of QuantumCircuit.'
+            )
         if self._verbose:
             write_current_line('Sending circuit to the API...')
         options = self.update_options(kwargs)

tests/remote/test_backend.py

@@ -22,6 +22,7 @@
 import pytest
 from qiskit import QiskitError, QuantumCircuit, execute, transpile
 from qiskit.providers import Options
+from qiskit.pulse.schedule import Schedule
 from qiskit.result import Result
 from qiskit.transpiler.exceptions import TranspilerError
 from requests_mock.mocker import Mocker
@@ -92,6 +93,21 @@ def test_too_many_qubits_clients_side(mocked_targets) -> None:
         execute(c, backend)
 
 
+def test_input_not_quantum_circuit(mocked_targets) -> None:
+    c1 = QuantumCircuit(1, 1)
+    c2 = QuantumCircuit(1, 1)
+    s1 = Schedule()
+    s2 = Schedule()
+    provider = AliceBobRemoteProvider(api_key='foo')
+    backend = provider.get_backend('EMU:1Q:LESCANNE_2020')
+    with pytest.raises(NotImplementedError):
+        execute([c1, c2], backend)
+    with pytest.raises(NotImplementedError):
+        execute(s1, backend)
+    with pytest.raises(NotImplementedError):
+        execute([s1, s2], backend)
+
+
 def test_counts_ordering(successful_job: Mocker) -> None:
     c = QuantumCircuit(1, 2)
     c.initialize('+', 0)