def test_amplitude_nonlocal(self, backend):
update_options = [
None,
peps.DirectUpdate(ImplicitRandomizedSVD(rank=2)),
peps.QRUpdate(rank=2),
peps.LocalGramQRUpdate(rank=2),
peps.LocalGramQRSVDUpdate(rank=2),
]
for option in update_options:
with self.subTest(update_option=option):
qstate = peps.computational_zeros(2, 3, backend=backend)
qstate.apply_circuit([
Gate('X', [], [0]),
Gate('H', [], [1]),
Gate('CX', [], [0, 5]),
Gate('CX', [], [1, 3]),
Gate('S', [], [1]),
],
update_option=option)
self.assertTrue(
np.isclose(qstate.amplitude([1, 0, 0, 0, 0, 1]),
1 / np.sqrt(2)))
self.assertTrue(
np.isclose(qstate.amplitude([1, 1, 0, 1, 0, 1]),
1j / np.sqrt(2)))
def test_amplitude_qr_update(self, backend):
qstate = peps.computational_zeros(2, 3, backend=backend)
qstate.apply_circuit([
Gate('X', [], [0]),
Gate('H', [], [1]),
Gate('CX', [], [0,3]),
Gate('CX', [], [1,4]),
Gate('S', [], [1]),
], update_option=peps.QRUpdate(rank=2))
contract_option = peps.BMPS(ReducedSVD(rank=2))
self.assertTrue(backend.isclose(qstate.amplitude([1,0,0,1,0,0], contract_option), 1/np.sqrt(2)))
self.assertTrue(backend.isclose(qstate.amplitude([1,1,0,1,1,0], contract_option), 1j/np.sqrt(2)))