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new e0eea46a9 Fix KeyError when shots not specified in Qiskit backend
(#899)
e0eea46a9 is described below
commit e0eea46a9c700a10ea500ca051e3d3ee17bb244c
Author: Ryan Huang <[email protected]>
AuthorDate: Wed Jan 21 23:28:08 2026 +0800
Fix KeyError when shots not specified in Qiskit backend (#899)
* Add default value for shots in backend configuration
* Add regression test for default shots parameter in backend configurations
---
qumat/qiskit_backend.py | 6 +++---
testing/qumat/test_create_circuit.py | 38 ++++++++++++++++++++++++++++++++++++
2 files changed, 41 insertions(+), 3 deletions(-)
diff --git a/qumat/qiskit_backend.py b/qumat/qiskit_backend.py
index e4c771870..25f6bb97a 100644
--- a/qumat/qiskit_backend.py
+++ b/qumat/qiskit_backend.py
@@ -21,7 +21,7 @@ from qiskit_aer import AerSimulator
def initialize_backend(backend_config):
backend_options = backend_config["backend_options"]
simulator_type = backend_options["simulator_type"]
- shots = backend_options["shots"]
+ shots = backend_options.get("shots", 1)
# Map legacy simulator types to AerSimulator methods
simulator_methods = {
@@ -125,14 +125,14 @@ def execute_circuit(circuit, backend, backend_config):
transpiled_circuit = qiskit.transpile(working_circuit, backend)
bound_circuit =
transpiled_circuit.assign_parameters(parameter_bindings)
job = backend.run(
- bound_circuit, shots=backend_config["backend_options"]["shots"]
+ bound_circuit,
shots=backend_config["backend_options"].get("shots", 1)
)
result = job.result()
return result.get_counts()
else:
transpiled_circuit = qiskit.transpile(working_circuit, backend)
job = backend.run(
- transpiled_circuit,
shots=backend_config["backend_options"]["shots"]
+ transpiled_circuit,
shots=backend_config["backend_options"].get("shots", 1)
)
result = job.result()
return result.get_counts()
diff --git a/testing/qumat/test_create_circuit.py
b/testing/qumat/test_create_circuit.py
index 69f741a72..869f5bcab 100644
--- a/testing/qumat/test_create_circuit.py
+++ b/testing/qumat/test_create_circuit.py
@@ -65,6 +65,44 @@ class TestCreateCircuit:
)
[email protected]("backend_name", TESTING_BACKENDS)
+class TestDefaultShotsParameter:
+ """Test that backends work without explicitly specifying shots
parameter."""
+
+ def test_execute_circuit_without_shots_parameter(self, backend_name):
+ """Test that circuits can be executed without specifying shots.
+
+ This is a regression test to ensure all backends have a default
+ value for the shots parameter, matching the README quick start example.
+ """
+ # Config without shots - should use default
+ configs = {
+ "qiskit": {
+ "backend_name": "qiskit",
+ "backend_options": {"simulator_type": "aer_simulator"},
+ },
+ "cirq": {
+ "backend_name": "cirq",
+ "backend_options": {"simulator_type": "default"},
+ },
+ "amazon_braket": {
+ "backend_name": "amazon_braket",
+ "backend_options": {"simulator_type": "local"},
+ },
+ }
+
+ backend_config = configs[backend_name]
+ qumat = QuMat(backend_config)
+ qumat.create_empty_circuit(num_qubits=2)
+ qumat.apply_hadamard_gate(0)
+ qumat.apply_cnot_gate(0, 1)
+
+ # Should not raise KeyError for missing 'shots'
+ result = qumat.execute_circuit()
+
+ assert result is not None
+
+
class TestBackendConfigValidation:
"""Test class for backend configuration validation."""
