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Fix execute_circuit to handle 0 num_qubits #589

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Merged
guan404ming merged 1 commit into from
Nov 4, 2025
Merged

Fix execute_circuit to handle 0 num_qubits #589

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9 changes: 9 additions & 0 deletions qumat/qumat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,10 +28,12 @@ def __init__(self, backend_config):
self.circuit = None
self.num_qubits = None
self.parameters = {}
self.num_qubits = None

def create_empty_circuit(self, num_qubits: int | None = None):
self.num_qubits = num_qubits
self.circuit = self.backend_module.create_empty_circuit(num_qubits)
self.num_qubits = num_qubits

def apply_not_gate(self, qubit_index):
self.backend_module.apply_not_gate(self.circuit, qubit_index)
Expand Down Expand Up @@ -71,6 +73,13 @@ def apply_pauli_z_gate(self, qubit_index):
self.backend_module.apply_pauli_z_gate(self.circuit, qubit_index)

def execute_circuit(self, parameter_values=None):
if self.num_qubits == 0:
shots = self.backend_config["backend_options"].get("shots", 1)
if self.backend_name == "cirq":
return [{0: shots}]
else:
return {"": shots}

if parameter_values:
self.bind_parameters(parameter_values)
self.backend_config["parameter_values"] = self.parameters # Pass parameters
Expand Down
2 changes: 1 addition & 1 deletion testing/test_create_circuit.py
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Expand Up @@ -60,7 +60,7 @@ def test_create_empty_circuit(self, backend_name):

assert qumat.circuit is not None

@pytest.mark.parametrize("num_qubits", [1, 3, 5])
@pytest.mark.parametrize("num_qubits", [0, 1, 3, 5])
def test_create_circuit_initializes_to_zero(self, backend_name, num_qubits):
"""Test that create_empty_circuit properly initializes all qubits to |0⟩."""
backend_config = self.get_backend_config(backend_name)
Expand Down