def test_2q_local_invariance_simple(self):
"""Check the local invariance parameters
for known simple cases.
"""
sim = UnitarySimulatorPy()
qr = QuantumRegister(2, name='q')
qc = QuantumCircuit(qr)
U = execute(qc, sim).result().get_unitary()
vec = two_qubit_local_invariants(U)
assert_allclose(vec, [1, 0, 3])
qr = QuantumRegister(2, name='q')
qc = QuantumCircuit(qr)
qc.cx(qr[1], qr[0])
U = execute(qc, sim).result().get_unitary()
vec = two_qubit_local_invariants(U)
assert_allclose(vec, [0, 0, 1])
qr = QuantumRegister(2, name='q')
qc = QuantumCircuit(qr)
qc.cx(qr[1], qr[0])
qc.cx(qr[0], qr[1])
U = execute(qc, sim).result().get_unitary()
vec = two_qubit_local_invariants(U)
assert_allclose(vec, [0, 0, -1])
qr = QuantumRegister(2, name='q')
qc = QuantumCircuit(qr)
qc.swap(qr[1], qr[0])
U = execute(qc, sim).result().get_unitary()
vec = two_qubit_local_invariants(U)
assert_allclose(vec, [-1, 0, -3])
def test_weyl_coordinates_random(self):
"""Randomly check Weyl coordinates with local invariants."""
for _ in range(10):
U = random_unitary(4).data
weyl = weyl_coordinates(U)
local_equiv = local_equivalence(weyl)
local = two_qubit_local_invariants(U)
assert_allclose(local, local_equiv)