Add support for delay instruction

This is made possible by a temporary fork of qiskit-qir.
Discussions to add the delay instruction to the upstream repo (or to
let the user define custom translation rules) are engaged in
microsoft/qiskit-qir#40

pyproject.toml

@@ -31,7 +31,7 @@ requires-python = ">=3.7"
 dependencies = [
     "requests",
     "qiskit-terra",
-    "qiskit-qir @ git+https://github.com/microsoft/qiskit-qir"
+    "qiskit-qir @ git+https://github.com/jrj-d/qiskit-qir@add_delay_instruction_using_an_extern"
 ]
 
 [project.optional-dependencies]

tests/test_backend.py

@@ -23,6 +23,7 @@
 from requests_mock.mocker import Mocker
 
 from qiskit_alice_bob_provider.api.client import AliceBobApiException
+from qiskit_alice_bob_provider.backend import _qiskit_to_qir
 from qiskit_alice_bob_provider.provider import AliceBobProvider
 
 
@@ -111,3 +112,15 @@ def test_failed_server_side_validation(failed_validation_job: Mocker) -> None:
     backend = provider.get_backend('SINGLE_CAT_SIMULATOR')
     with pytest.raises(AliceBobApiException):
         execute(c, backend)
+
+
+def test_delay_instruction_recognized() -> None:
+    c = QuantumCircuit(1, 2)
+    c.initialize('+', 0)
+    c.measure_x(0, 0)
+    c.delay(3000, 0, unit='ns')
+    c.measure(0, 1)
+    qir = _qiskit_to_qir(c)
+    l = ('call void @__quantum__qis__delay__body'
+         '(double 3.000000e+00, %Qubit* null)')
+    assert l in qir