def test_observable_measure_in_needs_one_circuit_x():
pauli1 = PauliString(spec="XI")
pauli2 = PauliString(spec="IX")
pauli3 = PauliString(spec="XX")
obs = Observable(pauli1, pauli2, pauli3)
qubits = cirq.LineQubit.range(2)
circuit = cirq.testing.random_circuit(qubits, 3, 1, random_state=1)
measures_obs_circuits = obs.measure_in(circuit)
assert len(measures_obs_circuits) == 1
expected = circuit + xrotation.on_each(*qubits) + cirq.measure(*qubits)
assert _equal(
measures_obs_circuits[0],
expected,
require_qubit_equality=True,
require_measurement_equality=True,
)
def test_observable_measure_in_needs_two_circuits():
obs = Observable(PauliString(spec="X"), PauliString(spec="Z"))
q = cirq.LineQubit(0)
circuit = cirq.Circuit(cirq.H.on(q))
measures_obs_circuits = sorted(obs.measure_in(circuit), key=len)
assert len(measures_obs_circuits) == 2
expected_circuits = [
circuit + cirq.measure(q),
circuit + xrotation.on(q) + cirq.measure(q),
]
for expected, measured in zip(expected_circuits, measures_obs_circuits):
assert _equal(
measured,
expected,
require_qubit_equality=True,
require_measurement_equality=True,
)