def test_non_consecutive_wires_error():
with qml.tape.QuantumTape() as tape:
qml.CNOT(wires=[0, 2])
with pytest.raises(
UnsupportedQuantumTapeError,
match="contiguously pack",
):
from_pennylane(tape)
def test_no_variance():
with qml.tape.QuantumTape() as tape:
qml.CNOT(wires=[0, 1])
qml.expval(qml.PauliZ(0))
with pytest.raises(
UnsupportedQuantumTapeError,
match="Measurements are not supported on the input tape.",
):
from_pennylane(tape)
def test_to_from_pennylane_identity():
q = cirq.LineQubit(0)
# Empty circuit
circuit = cirq.Circuit()
converted = from_pennylane(to_pennylane(circuit))
assert _equal(circuit, converted, require_qubit_equality=False)
circuit = cirq.Circuit(cirq.I(q))
# Identity gate
converted = from_pennylane(to_pennylane(circuit))
# TODO: test circuit equality after Identity operation will be added
# to PennyLane (https://github.com/PennyLaneAI/pennylane/issues/1632)
assert np.allclose(cirq.unitary(circuit), cirq.unitary(converted))
def test_integration():
n_wires = 4
gates = [
qml.PauliX,
qml.PauliY,
qml.PauliZ,
qml.S,
qml.T,
qml.RX,
qml.RY,
qml.RZ,
qml.Hadamard,
qml.Rot,
qml.CRot,
qml.Toffoli,
qml.SWAP,
qml.CSWAP,
qml.U1,
qml.U2,
qml.U3,
qml.CRX,
qml.CRY,
qml.CRZ,
]
layers = 3
np.random.seed(1967)
gates_per_layers = [np.random.permutation(gates) for _ in range(layers)]
with qml.tape.QuantumTape() as tape:
np.random.seed(1967)
for gates in gates_per_layers:
for gate in gates:
params = list(np.pi * np.random.rand(gate.num_params))
rnd_wires = np.random.choice(range(n_wires),
size=gate.num_wires,
replace=False)
gate(
*params,
wires=[
int(w) for w in rnd_wires
], # make sure we do not address wires as 0-d arrays
)
base_circ = from_pennylane(tape)
tape_recovered = to_pennylane(base_circ)
circ_recovered = from_pennylane(tape_recovered)
u_1 = cirq.unitary(base_circ)
u_2 = cirq.unitary(circ_recovered)
assert np.allclose(u_1, u_2)
def test_from_pennylane():
with qml.tape.QuantumTape() as tape:
qml.CNOT(wires=[0, 1])
circuit = from_pennylane(tape)
correct = cirq.Circuit(cirq.CNOT(*cirq.LineQubit.range(2)))
assert _equal(circuit, correct, require_qubit_equality=False)
def test_to_from_pennylane(random_state):
circuit = cirq.testing.random_circuit(
qubits=4, n_moments=2, op_density=1, random_state=random_state
)
converted = from_pennylane(to_pennylane(circuit))
# Gates (e.g. iSWAP) aren't guaranteed to be preserved. Check unitary
# instead of circuit equality.
cirq.testing.assert_allclose_up_to_global_phase(
cirq.unitary(converted), cirq.unitary(circuit), atol=1e-7
)
def test_integration():
gates = [
qml.PauliX(wires=0),
qml.PauliY(wires=0),
qml.PauliZ(wires=0),
qml.S(wires=0),
qml.T(wires=0),
qml.RX(0.4, wires=0),
qml.RY(0.4, wires=0),
qml.RZ(0.4, wires=0),
qml.Hadamard(wires=0),
qml.Rot(0.4, 0.5, 0.6, wires=1),
qml.CRot(0.4, 0.5, 0.6, wires=(0, 1)),
qml.Toffoli(wires=(0, 1, 2)),
qml.SWAP(wires=(0, 1)),
qml.CSWAP(wires=(0, 1, 2)),
qml.U1(0.4, wires=0),
qml.U2(0.4, 0.5, wires=0),
qml.U3(0.4, 0.5, 0.6, wires=0),
qml.CRX(0.4, wires=(0, 1)),
qml.CRY(0.4, wires=(0, 1)),
qml.CRZ(0.4, wires=(0, 1)),
]
layers = 3
np.random.seed(1967)
gates_per_layers = [np.random.permutation(gates) for _ in range(layers)]
with qml.tape.QuantumTape() as tape:
np.random.seed(1967)
for gates in gates_per_layers:
for gate in gates:
qml.apply(gate)
base_circ = from_pennylane(tape)
tape_recovered = to_pennylane(base_circ)
circ_recovered = from_pennylane(tape_recovered)
u_1 = cirq.unitary(base_circ)
u_2 = cirq.unitary(circ_recovered)
cirq.testing.assert_allclose_up_to_global_phase(u_1, u_2, atol=0)
def test_to_from_pennylane_cnot_same_gates():
qreg = cirq.LineQubit.range(2)
circuit = cirq.Circuit(cirq.CNOT(*qreg))
converted = from_pennylane(to_pennylane(circuit))
assert _equal(circuit, converted, require_qubit_equality=False)
def test_from_pennylane_unsupported_tapes():
with qml.tape.QuantumTape() as tape:
qml.CZ(wires=[0, "a"])
with pytest.raises(UnsupportedQuantumTapeError, match="could not sort"):
from_pennylane(tape)
