Provide support for Amplitude Estimation algorithms and similar

qiskit_ionq/helpers.py

@@ -35,6 +35,8 @@
 
 from qiskit.circuit import controlledgate as q_cgates
 from qiskit.circuit.library import standard_gates as q_gates
+from qiskit.qobj import QasmQobj
+from qiskit.assembler import disassemble
 
 from . import exceptions
 
@@ -59,9 +61,7 @@
     "id",
     "mcp",
     "mcphase",
-    "mct",
-    "mcx",
-    "mcx_gray",
+    # no mcx for now until terra issue 6271 is resolved
     "measure",
     "p",
     "rx",
@@ -90,8 +90,6 @@
     q_gates.x.CCXGate: "cx",  # just one C for all mcx
     q_gates.x.C3XGate: "cx",  # just one C for all mcx
     q_gates.x.C4XGate: "cx",  # just one C for all mcx
-    q_gates.x.MCXGate: "cx",  # just one C for all mcx
-    q_gates.x.MCXGrayCode: "cx",  # just one C for all mcx
     q_gates.t.TdgGate: "ti",
     q_gates.p.PhaseGate: "z",
     q_gates.RXXGate: "xx",
@@ -193,11 +191,7 @@ def qiskit_circ_to_ionq_circ(input_circuit):
 
             # Update converted gate values.
             converted.update(
-                {
-                    "gate": gate,
-                    "controls": controls,
-                    "targets": targets,
-                }
+                {"gate": gate, "controls": controls, "targets": targets,}
             )
 
         # if there's a valid instruction after a measurement,
@@ -292,17 +286,25 @@ def decompress_metadata_string_to_dict(input_string):  # pylint: disable=invalid
     return json.loads(decompressed)
 
 
-def qiskit_to_ionq(circuit, backend_name, passed_args=None):
-    """Convert a Qiskit circuit to a IonQ compatible dict.
+def qiskit_to_ionq(circuit_or_qobj, backend_name, passed_args=None):
+    """Serialize a Qiskit circuit to a IonQ compatible dict.
 
     Parameters:
-        circuit (:class:`qiskit.circuit.QuantumCircuit`): A Qiskit quantum circuit.
+        circuit_or_qobj (:class:`qiskit.circuit.QuantumCircuit` or :class:`qiskit.qobj.QasmQobj`):
+            A Qiskit quantum circuit or qobj containing a circuit in QASM.
         backend_name (str): Backend name.
         passed_args (dict): Dictionary containing additional passed arguments, eg. shots.
 
     Returns:
         dict: A dict with IonQ API compatible values.
     """
+    circuit = circuit_or_qobj
+    # if the submit job method gets passed a Qobj (possible via e.g. the Qiskit.execute method),
+    # pull the circuit off the Qobj. We don't need any of the rest of the context it provides.
+    if isinstance(circuit_or_qobj, QasmQobj):
+        circuit_list, _, _ = disassemble(circuit_or_qobj)
+        circuit = circuit_list.pop()
+
     passed_args = passed_args or {}
     ionq_circ, _, meas_map = qiskit_circ_to_ionq_circ(circuit)
     creg_sizes, clbit_labels = get_register_sizes_and_labels(circuit.cregs)
@@ -324,10 +326,7 @@ def qiskit_to_ionq(circuit, backend_name, passed_args=None):
         "lang": "json",
         "target": backend_name[5:],
         "shots": passed_args.get("shots"),
-        "body": {
-            "qubits": circuit.num_qubits,
-            "circuit": ionq_circ,
-        },
+        "body": {"qubits": circuit.num_qubits, "circuit": ionq_circ,},
         "registers": {"meas_mapped": meas_map},
         # store a couple of things we'll need later for result formatting
         "metadata": {

qiskit_ionq/ionq_backend.py

@@ -191,13 +191,7 @@ def run(self, circuit, **kwargs):
             kwargs["shots"] = self.options.shots
         passed_args = kwargs
 
-        job = ionq_job.IonQJob(
-            self,
-            None,
-            self.client,
-            circuit=circuit,
-            passed_args=passed_args,
-        )
+        job = ionq_job.IonQJob(self, None, self.client, circuit=circuit, passed_args=passed_args,)
         job.submit()
         return job
 
@@ -210,15 +204,6 @@ def retrieve_jobs(self, job_ids):
 
         return [ionq_job.IonQJob(self, job_id, self.client) for job_id in job_ids]
 
-    # TODO: Implement backend status checks.
-    def status(self):
-        """Not yet implemented.
-
-        Raises:
-            NotImplementedError: This behavior is not currently supported.
-        """
-        raise NotImplementedError("Backend status check is not supported.")
-
     def calibration(self):
         """Fetch the most recent calibration data for this backend.
 
@@ -290,7 +275,7 @@ def __init__(self, provider):
                 "memory": False,
                 "n_qubits": 29,
                 "conditional": False,
-                "max_shots": 1,
+                "max_shots": None,
                 "max_experiments": 1,
                 "open_pulse": False,
                 "gates": [{"name": "TODO", "parameters": [], "qasm_def": "TODO"}],

qiskit_ionq/ionq_job.py

@@ -217,7 +217,7 @@ def get_probabilities(self, circuit=None):  # pylint: disable=unused-argument
         """
         return self.result().get_probabilities()
 
-    def result(self):
+    def result(self, **kwargs):
         """Retrieve job result data.
 
         .. NOTE::
@@ -239,6 +239,9 @@ def result(self):
         Returns:
             Result: A Qiskit :class:`Result <qiskit.result.Result>` representation of this job.
         """
+        # we ignore all result args like timeout etc, but consume them for compatibility reasons
+        _ = kwargs
+
         # Short-circuit if we have already cached the result for this job.
         if self._result is not None:
             return self._result

test/helpers/test_gate_serialization.py

@@ -60,12 +60,6 @@
     ("i", [0], []),
     ("id", [0], []),
     ("mcp", [0.5, [0, 1], 2], [{"gate": "z", "rotation": 0.5, "targets": [2], "controls": [0, 1]}]),
-    ("mct", [[0, 1], 2], [{"gate": "x", "targets": [2], "controls": [0, 1]}]),
-    ("mcx", [[0, 1], 2], [{"gate": "x", "targets": [2], "controls": [0, 1]}]),
-    # make sure that multi-control can take any number of controls
-    ("mcx", [[0, 1, 2], 3], [{"gate": "x", "targets": [3], "controls": [0, 1, 2]}]),
-    ("mcx", [[0, 1, 2, 3], 4], [{"gate": "x", "targets": [4], "controls": [0, 1, 2, 3]}]),
-    ("mcx", [[0, 1, 2, 3, 4], 5], [{"gate": "x", "targets": [5], "controls": [0, 1, 2, 3, 4]}]),
     ("measure", [0, 0], []),
     ("p", [0, 0], [{"gate": "z", "rotation": 0, "targets": [0]}]),
     ("p", [0.5, 0], [{"gate": "z", "rotation": 0.5, "targets": [0]}]),

test/helpers/test_qiskit_to_ionq.py

@@ -29,6 +29,7 @@
 import json
 
 from qiskit import QuantumCircuit, QuantumRegister, ClassicalRegister
+from qiskit.compiler import assemble
 
 from qiskit_ionq.helpers import qiskit_to_ionq, decompress_metadata_string_to_dict
 
@@ -190,3 +191,58 @@ def test_full_circuit(simulator_backend):
     assert actual_metadata_header == expected_metadata_header
     assert actual_output_map == expected_output_map
     assert actual == expected_rest_of_payload
+
+
+def test_full_circuit_from_qobj(simulator_backend):
+    """Test a full circuit
+
+    Args:
+        simulator_backend (IonQSimulatorBackend): A simulator backend fixture.
+    """
+    qc = QuantumCircuit(2, 2, name="test_name")
+    qc.cnot(1, 0)
+    qc.h(1)
+    qc.measure(1, 0)
+    qc.measure(0, 1)
+    qobj = assemble(qc, backend=simulator_backend, shots=200)
+    ionq_json = qiskit_to_ionq(
+        qobj, simulator_backend.name(), passed_args={"shots": 200, "sampler_seed": 42}
+    )
+    expected_metadata_header = {
+        "memory_slots": 2,
+        "global_phase": 0,
+        "n_qubits": 2,
+        "name": "test_name",
+        "creg_sizes": [["c", 2]],
+        "clbit_labels": [["c", 0], ["c", 1]],
+        "qreg_sizes": [["q", 2]],
+        "qubit_labels": [["q", 0], ["q", 1]],
+    }
+    expected_output_map = [1, 0]
+    expected_metadata = {"shots": "200", "sampler_seed": "42"}
+    expected_rest_of_payload = {
+        "lang": "json",
+        "target": "simulator",
+        "shots": 200,
+        "body": {
+            "qubits": 2,
+            "circuit": [
+                {"gate": "x", "controls": [1], "targets": [0]},
+                {"gate": "h", "targets": [1]},
+            ],
+        },
+    }
+
+    actual = json.loads(ionq_json)
+    actual_metadata = actual.pop("metadata") or {}
+    actual_metadata_header = decompress_metadata_string_to_dict(
+        actual_metadata.pop("qiskit_header") or None
+    )
+    actual_maps = actual.pop("registers") or {}
+    actual_output_map = actual_maps.pop("meas_mapped") or []
+
+    # check dict equality:
+    assert actual_metadata == expected_metadata
+    assert actual_metadata_header == expected_metadata_header
+    assert actual_output_map == expected_output_map
+    assert actual == expected_rest_of_payload

test/ionq_backend/test_base_backend.py

@@ -37,19 +37,6 @@
 from .. import conftest
 
 
-def test_status_not_implemented(mock_backend):
-    """Test that by default, `status` is not implemented.
-
-    Args:
-        mock_backend (MockBackend): A fake/mock IonQBackend.
-    """
-
-    with pytest.raises(NotImplementedError) as exc_info:
-        mock_backend.status()
-
-    assert str(exc_info.value) == "Backend status check is not supported."
-
-
 def test_client_property(mock_backend):
     """
     Test that the client property is an IonQClient instance.