def test_circuit_is_not_mutated_by_executors():
single_qubit_circ = QuantumCircuit(1, 1)
single_qubit_circ.z(0)
expected_circuit = single_qubit_circ.copy()
execute_with_shots_and_noise(
circuit=single_qubit_circ,
obs=ONE_QUBIT_GS_PROJECTOR,
noise_model=initialized_depolarizing_noise(NOISE),
shots=SHOTS,
)
assert single_qubit_circ.data == expected_circuit.data
assert single_qubit_circ == expected_circuit
execute_with_noise(
circuit=single_qubit_circ,
obs=ONE_QUBIT_GS_PROJECTOR,
noise_model=initialized_depolarizing_noise(NOISE),
)
assert single_qubit_circ.data == expected_circuit.data
assert single_qubit_circ == expected_circuit
def test_execute_with_depolarizing_noise_two_qubit():
"""Tests the noisy sampling executor across increasing levels of
two qubit gate noise.
"""
two_qubit_circ = QuantumCircuit(2)
# noise model is defined on gates so include the gate to
# demonstrate noise
two_qubit_circ.cx(0, 1)
noiseless_exp_value = 1.0
expectation_value = execute_with_noise(
circuit=two_qubit_circ,
obs=TWO_QUBIT_GS_PROJECTOR,
noise_model=initialized_depolarizing_noise(NOISE),
)
# anticipate that the expectation value will be less than
# the noiseless simulation of the same circuit
assert expectation_value < noiseless_exp_value