def test_two_qubit_reduction(self):
""" Test mapping to qubit operator with two qubit reduction """
mapper = ParityMapper()
qubit_conv = QubitConverter(mapper, two_qubit_reduction=True)
with self.subTest('Two qubit reduction ignored as no num particles given'):
qubit_op = qubit_conv.convert(self.h2_op)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_PARITY)
self.assertIsNone(qubit_conv.num_particles)
with self.subTest('Two qubit reduction, num particles given'):
qubit_op = qubit_conv.convert(self.h2_op, self.num_particles)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_PARITY_2Q_REDUCED)
self.assertEqual(qubit_conv.num_particles, self.num_particles)
with self.subTest('convert_match()'):
qubit_op = qubit_conv.convert_match(self.h2_op)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_PARITY_2Q_REDUCED)
self.assertEqual(qubit_conv.num_particles, self.num_particles)
with self.subTest('State is reset (Num particles lost)'):
qubit_op = qubit_conv.convert(self.h2_op)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_PARITY)
self.assertIsNone(qubit_conv.num_particles)
with self.subTest('Num particles given again'):
qubit_op = qubit_conv.convert(self.h2_op, self.num_particles)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_PARITY_2Q_REDUCED)
with self.subTest('Set for no two qubit reduction'):
qubit_conv.two_qubit_reduction = False
self.assertFalse(qubit_conv.two_qubit_reduction)
qubit_op = qubit_conv.convert(self.h2_op)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_PARITY)
def test_mapping_basic(self):
""" Test mapping to qubit operator """
mapper = JordanWignerMapper()
qubit_conv = QubitConverter(mapper)
qubit_op = qubit_conv.convert(self.h2_op)
self.assertIsInstance(qubit_op, PauliSumOp)
# Note: The PauliSumOp equals, as used in the test below, use the equals of the
# SparsePauliOp which in turn uses np.allclose() to determine equality of
# coeffs. So the reference operator above will be matched on that basis so
# we don't need to worry about tiny precision changes for any reason.
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_JW)
with self.subTest('Re-use test'):
qubit_op = qubit_conv.convert(self.h2_op)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_JW)
with self.subTest('convert_match()'):
qubit_op = qubit_conv.convert_match(self.h2_op)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_JW)
with self.subTest('Re-use with different mapper'):
qubit_conv.mapper = ParityMapper()
qubit_op = qubit_conv.convert(self.h2_op)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_PARITY)
with self.subTest('Set two qubit reduction - no effect without num particles'):
qubit_conv.two_qubit_reduction = True
qubit_op = qubit_conv.convert_match(self.h2_op)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_PARITY)
with self.subTest('Force match set num particles'):
qubit_conv.force_match(self.num_particles)
qubit_op = qubit_conv.convert_match(self.h2_op)
self.assertEqual(qubit_op, TestQubitConverter.REF_H2_PARITY_2Q_REDUCED)
