def test_auto_split_detection(self):
psi0 = MPS_computational_state('00')
CNOT = qu.controlled('not')
ISWAP = qu.iswap()
G = qu.rand_uni(4)
opts = {'contract': 'auto-split-gate', 'where': (0, 1)}
psi_cnot = psi0.gate(CNOT, **opts)
psi_iswap = psi0.gate(ISWAP, **opts)
psi_G = psi0.gate(G, **opts)
assert (psi_cnot.max_bond() == psi_iswap.max_bond() ==
psi_G.max_bond() == 2)
assert len(psi_cnot.tensors) == len(psi_iswap.tensors) == 4
assert len(psi_G.tensors) == 3
def test_controlled_z_sparse(self):
cz = qu.controlled('z', sparse=True)
assert (qu.issparse(cz))
assert_allclose(cz.A, np.diag([1, 1, 1, -1]))
def test_controlled_z_dense(self):
cz = qu.controlled('z')
assert_allclose(cz, np.diag([1, 1, 1, -1]))
def test_swap_gating(self):
psi0 = MPS_rand_state(20, 5)
CNOT = qu.controlled('not')
psi0XX = psi0.gate(CNOT, (4, 13))
psi0XX_s = psi0.gate_with_auto_swap(CNOT, (4, 13))
assert psi0XX.H @ psi0XX_s == pytest.approx(1.0)