def test_expand(self):
"""Test tensor two quantum errors."""
noise_x = QuantumError([((IGate(), [0]), 0.9), ((XGate(), [0]), 0.1)])
noise_y = QuantumError([((IGate(), [0]), 0.8), ((YGate(), [0]), 0.2)])
actual = noise_y.expand(noise_x) # reversed order of expand
expected = QuantumError([([(IGate(), [1]), (IGate(), [0])], 0.9 * 0.8),
([(IGate(), [1]), (YGate(), [0])], 0.9 * 0.2),
([(XGate(), [1]), (IGate(), [0])], 0.1 * 0.8),
([(XGate(), [1]), (YGate(), [0])], 0.1 * 0.2)])
self.assertEqual(actual, expected)
def test_expand_both_unitary_instruction(self):
"""Test expand of two unitary instruction errors."""
unitaries0 = self.mixed_unitary_error([0.9, 0.1], ['z', 's'])
unitaries1 = self.mixed_unitary_error([0.6, 0.4], ['x', 'y'])
error0 = QuantumError(unitaries0, standard_gates=False)
error1 = QuantumError(unitaries1, standard_gates=False)
error = error0.expand(error1)
target = SuperOp(Kraus(unitaries0)).expand(Kraus(unitaries1))
for j in range(4):
circ, _ = error.error_term(j)
self.assertEqual(circ[0]['name'], 'unitary')
self.assertEqual(circ[0]['qubits'], [0, 1])
self.assertEqual(SuperOp(error), target)
def test_expand_both_unitary_standard_gates(self):
"""Test expand of two unitary standard gate errors"""
unitaries0 = self.mixed_unitary_error([0.9, 0.1], ['z', 's'])
unitaries1 = self.mixed_unitary_error([0.6, 0.4], ['x', 'y'])
error0 = QuantumError(unitaries0, standard_gates=True)
error1 = QuantumError(unitaries1, standard_gates=True)
error = error0.expand(error1)
target = SuperOp(Kraus(unitaries0)).expand(Kraus(unitaries1))
for j in range(4):
circ, _ = error.error_term(j)
self.assertEqual(len(circ), 2)
for instr in circ:
self.assertIn(instr['name'], ['s', 'x', 'y', 'z'])
self.assertIn(instr['qubits'], [[0], [1]])
self.assertEqual(SuperOp(error), target)