def vacuum_operator(fer_op):
"""Use the stabilizers to find the vacuum state in bravyi_kitaev_fast.
Args:
fer_op (FermionicOperator): the fermionic operator in the second quanitzed form
Returns:
Operator: the qubit operator
"""
edge_list = bravyi_kitaev_fast_edge_list(fer_op)
num_qubits = edge_list.shape[1]
vac_operator = Operator(paulis=[[1.0, label_to_pauli('I' * num_qubits)]])
g = networkx.Graph()
g.add_edges_from(tuple(edge_list.transpose()))
stabs = np.asarray(networkx.cycle_basis(g))
for stab in stabs:
a = Operator(paulis=[[1.0, label_to_pauli('I' * num_qubits)]])
stab = np.asarray(stab)
for i in range(np.size(stab)):
a = a * edge_operator_aij(edge_list, stab[i],
stab[(i + 1) % np.size(stab)])
a.scaling_coeff(1j)
a += Operator(paulis=[[1.0, label_to_pauli('I' * num_qubits)]])
vac_operator = vac_operator * a
vac_operator.scaling_coeff(np.sqrt(2))
return vac_operator
def test_dia_matrix(self):
"""
test conversion to dia_matrix
"""
num_qubits = 4
pauli_term = []
for pauli_label in itertools.product('IZ', repeat=num_qubits):
coeff = np.random.random(1)[0]
pauli_term.append([coeff, label_to_pauli(pauli_label)])
op = Operator(paulis=pauli_term)
op.convert('paulis', 'matrix')
op.convert('matrix', 'grouped_paulis')
op._to_dia_matrix('grouped_paulis')
self.assertEqual(op.matrix.ndim, 1)
num_qubits = 4
pauli_term = []
for pauli_label in itertools.product('YZ', repeat=num_qubits):
coeff = np.random.random(1)[0]
pauli_term.append([coeff, label_to_pauli(pauli_label)])
op = Operator(paulis=pauli_term)
op.convert('paulis', 'matrix')
op._to_dia_matrix('matrix')
self.assertEqual(op.matrix.ndim, 2)
def test_equal_operator(self):
paulis = ['IXYZ', 'XXZY', 'IIZZ', 'XXYY', 'ZZXX', 'YYYY']
coeffs = [0.2, 0.6, 0.8, -0.2, -0.6, -0.8]
op1 = Operator(paulis=[])
for coeff, pauli in zip(coeffs, paulis):
pauli_term = [coeff, label_to_pauli(pauli)]
op1 += Operator(paulis=[pauli_term])
paulis = ['IXYZ', 'XXZY', 'IIZZ', 'XXYY', 'ZZXX', 'YYYY']
coeffs = [0.2, 0.6, 0.8, -0.2, -0.6, -0.8]
op2 = Operator(paulis=[])
for coeff, pauli in zip(coeffs, paulis):
pauli_term = [coeff, label_to_pauli(pauli)]
op2 += Operator(paulis=[pauli_term])
paulis = ['IXYY', 'XXZY', 'IIZZ', 'XXYY', 'ZZXX', 'YYYY']
coeffs = [0.2, 0.6, 0.8, -0.2, -0.6, -0.8]
op3 = Operator(paulis=[])
for coeff, pauli in zip(coeffs, paulis):
pauli_term = [coeff, label_to_pauli(pauli)]
op3 += Operator(paulis=[pauli_term])
paulis = ['IXYZ', 'XXZY', 'IIZZ', 'XXYY', 'ZZXX', 'YYYY']
coeffs = [-0.2, 0.6, 0.8, -0.2, -0.6, -0.8]
op4 = Operator(paulis=[])
for coeff, pauli in zip(coeffs, paulis):
pauli_term = [coeff, label_to_pauli(pauli)]
op4 += Operator(paulis=[pauli_term])
self.assertEqual(op1, op2)
self.assertNotEqual(op1, op3)
self.assertNotEqual(op1, op4)
self.assertNotEqual(op3, op4)
def vacuum_operator(fer_op):
"""Use the stabilizers to find the vacuum state in BKSF.
This operator can be used to generate the vaccum state for
BKSF mapping.
Upon having this operator, operate it on `orignal` vaccum state |000...>,
and resulted state is the vacuum state for bksf mapping.
Args:
fer_op (FermionicOperator): the fermionic operator in the second quanitzed form
Returns:
Operator: the qubit operator
"""
edge_list = bksf_edge_list(fer_op)
num_qubits = edge_list.shape[1]
vac_operator = Operator(paulis=[[1.0, label_to_pauli('I' * num_qubits)]])
g = networkx.Graph()
g.add_edges_from(tuple(edge_list.transpose()))
stabs = np.asarray(networkx.cycle_basis(g))
for stab in stabs:
a = Operator(paulis=[[1.0, label_to_pauli('I' * num_qubits)]])
stab = np.asarray(stab)
for i in range(np.size(stab)):
a = a * edge_operator_aij(edge_list, stab[i],
stab[(i + 1) % np.size(stab)])
a.scaling_coeff(1j)
a += Operator(paulis=[[1.0, label_to_pauli('I' * num_qubits)]])
vac_operator = vac_operator * a
vac_operator.scaling_coeff(np.sqrt(2))
return vac_operator
def test_zero_coeff(self):
"""
test addition
"""
pauli_a = 'IXYZ'
pauli_b = 'IXYZ'
coeff_a = 0.5
coeff_b = -0.5
pauli_term_a = [coeff_a, label_to_pauli(pauli_a)]
pauli_term_b = [coeff_b, label_to_pauli(pauli_b)]
opA = Operator(paulis=[pauli_term_a])
opB = Operator(paulis=[pauli_term_b])
newOP = opA + opB
newOP.zeros_coeff_elimination()
self.assertEqual(0, len(newOP.paulis),
"{}".format(newOP.print_operators()))
paulis = ['IXYZ', 'XXZY', 'IIZZ', 'XXYY', 'ZZXX', 'YYYY']
coeffs = [0.2, 0.6, 0.8, -0.2, -0.6, -0.8]
op = Operator(paulis=[])
for coeff, pauli in zip(coeffs, paulis):
pauli_term = [coeff, label_to_pauli(pauli)]
op += Operator(paulis=[pauli_term])
for i in range(6):
opA = Operator(paulis=[[-coeffs[i], label_to_pauli(paulis[i])]])
op += opA
op.zeros_coeff_elimination()
self.assertEqual(6 - (i + 1), len(op.paulis))
def number_operator(fer_op, mode_number=None):
"""Find the number operator in BKSF representation.
This operator can be used to examine the number of particle in
a given eigenstate.
If `mode_number` is None, it checks how many particles in the eigenstate.
If `mode_number` is not None, it will only check whether or not
that particle at `mode_number` in the eigenstate.
Args:
fer_op (FermionicOperator): the fermionic operator in the second quanitzed form
mode_number (int): index, it corresponds to the mode for which number operator is required.
Returns:
Operator: the qubit operator
"""
modes = fer_op.h1.modes
edge_list = bksf_edge_list(fer_op)
num_qubits = edge_list.shape[1]
num_operator = Operator(paulis=[[1.0, label_to_pauli('I' * num_qubits)]])
if mode_number is None:
for i in range(modes):
num_operator -= edge_operator_bi(edge_list, i)
num_operator += Operator(
paulis=[[1.0 *
modes, label_to_pauli('I' * num_qubits)]])
else:
num_operator += (
Operator(paulis=[[1.0, label_to_pauli('I' * num_qubits)]]) -
edge_operator_bi(edge_list, mode_number))
num_operator.scaling_coeff(0.5)
return num_operator
def test_bksf_edge_op_bi(self):
"""Test bksf mapping, edge operator bi"""
edge_matrix = np.triu(np.ones((4, 4)))
edge_list = np.array(
np.nonzero(np.triu(edge_matrix) - np.diag(np.diag(edge_matrix))))
qterm_b0 = edge_operator_bi(edge_list, 0)
qterm_b1 = edge_operator_bi(edge_list, 1)
qterm_b2 = edge_operator_bi(edge_list, 2)
qterm_b3 = edge_operator_bi(edge_list, 3)
ref_qterm_b0 = Operator(paulis=[[1.0, label_to_pauli('ZZZIII')]])
ref_qterm_b1 = Operator(paulis=[[1.0, label_to_pauli('ZIIZZI')]])
ref_qterm_b2 = Operator(paulis=[[1.0, label_to_pauli('IZIZIZ')]])
ref_qterm_b3 = Operator(paulis=[[1.0, label_to_pauli('IIZIZZ')]])
self.assertEqual(
qterm_b0, ref_qterm_b0,
"\n{} vs \n{}".format(qterm_b0.print_operators(),
ref_qterm_b0.print_operators()))
self.assertEqual(
qterm_b1, ref_qterm_b1,
"\n{} vs \n{}".format(qterm_b1.print_operators(),
ref_qterm_b1.print_operators()))
self.assertEqual(
qterm_b2, ref_qterm_b2,
"\n{} vs \n{}".format(qterm_b2.print_operators(),
ref_qterm_b2.print_operators()))
self.assertEqual(
qterm_b3, ref_qterm_b3,
"\n{} vs \n{}".format(qterm_b3.print_operators(),
ref_qterm_b3.print_operators()))
def number_operator(fer_op, mode_number=None):
"""Find the qubit operator for the number operator in bravyi_kitaev_fast representation
Args:
fer_op (FermionicOperator): the fermionic operator in the second quanitzed form
mode_number (int): index, it corresponds to the mode for which number operator is required.
Returns:
Operator: the qubit operator
"""
modes = fer_op.h1.modes
edge_list = bravyi_kitaev_fast_edge_list(fer_op)
num_qubits = edge_list.shape[1]
num_operator = Operator(paulis=[[1.0, label_to_pauli('I' * num_qubits)]])
if mode_number is None:
for i in range(modes):
num_operator -= edge_operator_bi(edge_list, i)
num_operator += Operator(
paulis=[[1.0 *
modes, label_to_pauli('I' * num_qubits)]])
else:
num_operator += (
Operator(paulis=[[1.0, label_to_pauli('I' * num_qubits)]]) -
edge_operator_bi(edge_list, mode_number))
num_operator.scaling_coeff(0.5)
return num_operator
def test_subtraction_matrix(self):
"""
test subtraction in the matrix mode
"""
pauli_a = 'IX'
pauli_b = 'ZY'
coeff_a = 0.5
coeff_b = 0.5
pauli_term_a = [coeff_a, label_to_pauli(pauli_a)]
pauli_term_b = [coeff_b, label_to_pauli(pauli_b)]
opA = Operator(paulis=[pauli_term_a])
opB = Operator(paulis=[pauli_term_b])
opA.to_matrix()
opB.to_matrix()
opA -= opB
opA.to_paulis()
self.assertEqual(2, len(opA.paulis))
self.assertEqual(0.5, opA.paulis[0][0])
self.assertEqual(-0.5, opA.paulis[1][0])
pauli_c = 'IX'
coeff_c = 0.25
pauli_term_c = [coeff_c, label_to_pauli(pauli_c)]
op_c = Operator(paulis=[pauli_term_c])
op_c.to_matrix()
opA.to_matrix()
opA -= op_c
opA.to_paulis()
self.assertEqual(2, len(opA.paulis))
self.assertEqual(0.25, opA.paulis[0][0])
def test_addition_noninplace(self):
"""
test addition
"""
pauli_a = 'IXYZ'
pauli_b = 'ZYIX'
coeff_a = 0.5
coeff_b = 0.5
pauli_term_a = [coeff_a, label_to_pauli(pauli_a)]
pauli_term_b = [coeff_b, label_to_pauli(pauli_b)]
opA = Operator(paulis=[pauli_term_a])
opB = Operator(paulis=[pauli_term_b])
copy_opA = copy.deepcopy(opA)
newOP = opA + opB
self.assertEqual(copy_opA, opA)
self.assertEqual(2, len(newOP.paulis))
pauli_c = 'IXYZ'
coeff_c = 0.25
pauli_term_c = [coeff_c, label_to_pauli(pauli_c)]
newOP = newOP + Operator(paulis=[pauli_term_c])
self.assertEqual(2, len(newOP.paulis))
self.assertEqual(0.75, newOP.paulis[0][0])
def test_str(self):
"""
test str
"""
pauli_a = 'IXYZ'
pauli_b = 'ZYIX'
coeff_a = 0.5
coeff_b = 0.5
pauli_term_a = [coeff_a, label_to_pauli(pauli_a)]
pauli_term_b = [coeff_b, label_to_pauli(pauli_b)]
opA = Operator(paulis=[pauli_term_a])
opB = Operator(paulis=[pauli_term_b])
opA += opB
self.assertEqual("Representation: paulis, qubits: 4, size: 2", str(opA))
def test_create_from_paulis_0(self):
"""
test with single paulis
"""
num_qubits = 4
for pauli_label in itertools.product('IXYZ', repeat=num_qubits):
coeff = np.random.random(1)[0]
pauli_term = [coeff, label_to_pauli(pauli_label)]
op = Operator(paulis=[pauli_term])
op.convert('paulis', 'matrix')
op.convert('paulis', 'grouped_paulis')
depth = 1
var_form = get_variational_form_instance('RYRZ')
var_form.init_args(op.num_qubits, depth)
circuit = var_form.construct_circuit(
np.array(np.random.randn(var_form.num_parameters)))
execute_config = {'shots': 1, 'skip_transpiler': False}
matrix_mode = op.eval('matrix', circuit,
'local_statevector_simulator',
execute_config)[0]
non_matrix_mode = op.eval('paulis', circuit,
'local_statevector_simulator',
execute_config)[0]
def test_group_paulis_2(self):
"""
Test with normal grouping approach
"""
num_qubits = 4
pauli_term = []
for pauli_label in itertools.product('IXYZ', repeat=num_qubits):
coeff = np.random.random(1)[0]
pauli_term.append([coeff, label_to_pauli(''.join(pauli_label))])
op = Operator(paulis=pauli_term)
op.coloring = None
paulis = copy.deepcopy(op.paulis)
op.convert("paulis", "grouped_paulis")
flattened_grouped_paulis = [
pauli for group in op.grouped_paulis for pauli in group[1:]
]
for gp in flattened_grouped_paulis:
passed = False
for p in paulis:
if p[1] == gp[1]:
passed = p[0] == gp[0]
break
self.assertTrue(
passed, "non-existed paulis in grouped_paulis: {}".format(
gp[1].to_label()))
def test_chop_complex_only_2(self):
paulis = ['IXYZ', 'XXZY', 'IIZZ', 'XXYY', 'ZZXX', 'YYYY']
coeffs = [
0.2 + -1j * 0.8, 0.6 + -1j * 0.6, 0.8 + -1j * 0.2,
-0.2 + -1j * 0.8, -0.6 - -1j * 0.6, -0.8 - -1j * 0.2
]
op = Operator(paulis=[])
for coeff, pauli in zip(coeffs, paulis):
pauli_term = [coeff, label_to_pauli(pauli)]
op += Operator(paulis=[pauli_term])
op1 = copy.deepcopy(op)
op1.chop(threshold=0.4)
self.assertEqual(len(op1.paulis), 6,
"\n{}".format(op1.print_operators()))
op2 = copy.deepcopy(op)
op2.chop(threshold=0.7)
self.assertEqual(len(op2.paulis), 4,
"\n{}".format(op2.print_operators()))
op3 = copy.deepcopy(op)
op3.chop(threshold=0.9)
self.assertEqual(len(op3.paulis), 0,
"\n{}".format(op3.print_operators()))
def test_label_to_pauli(self):
label = 'ZXYI'
p = label_to_pauli(label)
v = np.asarray([1, 0, 1, 0])
w = np.asarray([0, 1, 1, 0])
p2 = Pauli(v, w)
self.assertEqual(p, p2)
def test_multiplication(self):
"""
test multiplication
"""
pauli_a = 'IXYZ'
pauli_b = 'ZYIX'
coeff_a = 0.5
coeff_b = 0.5
pauli_term_a = [coeff_a, label_to_pauli(pauli_a)]
pauli_term_b = [coeff_b, label_to_pauli(pauli_b)]
opA = Operator(paulis=[pauli_term_a])
opB = Operator(paulis=[pauli_term_b])
newOP = opA * opB
# print(newOP.print_operators())
self.assertEqual(1, len(newOP.paulis))
self.assertEqual(-0.25, newOP.paulis[0][0])
self.assertEqual('ZZYY', newOP.paulis[0][1].to_label())
def test_zero_elimination(self):
pauli_a = 'IXYZ'
coeff_a = 0.0
pauli_term_a = [coeff_a, label_to_pauli(pauli_a)]
opA = Operator(paulis=[pauli_term_a])
self.assertEqual(1, len(opA.paulis), "{}".format(opA.print_operators()))
opA.zeros_coeff_elimination()
self.assertEqual(0, len(opA.paulis), "{}".format(opA.print_operators()))
def test_scaling_coeff(self):
"""
test scale
"""
pauli_a = 'IXYZ'
pauli_b = 'ZYIX'
coeff_a = 0.5
coeff_b = 0.5
pauli_term_a = [coeff_a, label_to_pauli(pauli_a)]
pauli_term_b = [coeff_b, label_to_pauli(pauli_b)]
opA = Operator(paulis=[pauli_term_a])
opB = Operator(paulis=[pauli_term_b])
opA += opB
self.assertEqual(2, len(opA.paulis))
opA.scaling_coeff(0.7)
self.assertEqual(2, len(opA.paulis))
self.assertEqual(0.35, opA.paulis[0][0])
def Hamiltonian_from_file(file_name):
"""Compute the pauli_list from a file."""
with open(file_name, 'r+') as file:
ham_array = file.readlines()
ham_array = [x.strip() for x in ham_array]
pauli_list = []
for i in range(len(ham_array)//2):
pauli = label_to_pauli(ham_array[2*i])
Numb = float(ham_array[2*i+1])
pauli_list.append([Numb, pauli])
return pauli_list
def test_negation_operator(self):
paulis = ['IXYZ', 'XXZY', 'IIZZ', 'XXYY', 'ZZXX', 'YYYY']
coeffs = [0.2, 0.6, 0.8, -0.2, -0.6, -0.8]
op1 = Operator(paulis=[])
for coeff, pauli in zip(coeffs, paulis):
pauli_term = [coeff, label_to_pauli(pauli)]
op1 += Operator(paulis=[pauli_term])
paulis = ['IXYZ', 'XXZY', 'IIZZ', 'XXYY', 'ZZXX', 'YYYY']
coeffs = [-0.2, -0.6, -0.8, 0.2, 0.6, 0.8]
op2 = Operator(paulis=[])
for coeff, pauli in zip(coeffs, paulis):
pauli_term = [coeff, label_to_pauli(pauli)]
op2 += Operator(paulis=[pauli_term])
self.assertNotEqual(op1, op2)
self.assertEqual(op1, -op2)
self.assertEqual(-op1, op2)
op1.scaling_coeff(-1.0)
self.assertEqual(op1, op2)
def test_addition_inplace(self):
"""
test addition
"""
pauli_a = 'IXYZ'
pauli_b = 'ZYIX'
coeff_a = 0.5
coeff_b = 0.5
pauli_term_a = [coeff_a, label_to_pauli(pauli_a)]
pauli_term_b = [coeff_b, label_to_pauli(pauli_b)]
opA = Operator(paulis=[pauli_term_a])
opB = Operator(paulis=[pauli_term_b])
opA += opB
self.assertEqual(2, len(opA.paulis))
pauli_c = 'IXYZ'
coeff_c = 0.25
pauli_term_c = [coeff_c, label_to_pauli(pauli_c)]
opA += Operator(paulis=[pauli_term_c])
self.assertEqual(2, len(opA.paulis))
self.assertEqual(0.75, opA.paulis[0][0])
def test_load_from_file(self):
paulis = ['IXYZ', 'XXZY', 'IIZZ', 'XXYY', 'ZZXX', 'YYYY']
coeffs = [0.2 + -1j * 0.8, 0.6 + -1j * 0.6, 0.8 + -1j * 0.2,
-0.2 + -1j * 0.8, -0.6 - -1j * 0.6, -0.8 - -1j * 0.2]
op = Operator(paulis=[])
for coeff, pauli in zip(coeffs, paulis):
pauli_term = [coeff, label_to_pauli(pauli)]
op += Operator(paulis=[pauli_term])
op.save_to_file('temp_op.json')
load_op = Operator.load_from_file('temp_op.json')
self.assertTrue(os.path.exists('temp_op.json'))
self.assertEqual(op, load_op)
os.remove('temp_op.json')
def test_chop_complex_only_1(self):
paulis = ['IXYZ', 'XXZY', 'IIZZ', 'XXYY', 'ZZXX', 'YYYY']
coeffs = [
0.2 + -1j * 0.2, 0.6 + -1j * 0.6, 0.8 + -1j * 0.8,
-0.2 + -1j * 0.2, -0.6 - -1j * 0.6, -0.8 - -1j * 0.8
]
op = Operator(paulis=[])
for coeff, pauli in zip(coeffs, paulis):
pauli_term = [coeff, label_to_pauli(pauli)]
op += Operator(paulis=[pauli_term])
op1 = copy.deepcopy(op)
op1.chop(threshold=0.4)
self.assertEqual(len(op1.paulis), 4,
"\n{}".format(op1.print_operators()))
gt_op1 = Operator(paulis=[])
for i in range(1, 3):
pauli_term = [coeffs[i], label_to_pauli(paulis[i])]
gt_op1 += Operator(paulis=[pauli_term])
pauli_term = [coeffs[i + 3], label_to_pauli(paulis[i + 3])]
gt_op1 += Operator(paulis=[pauli_term])
self.assertEqual(op1, gt_op1)
op2 = copy.deepcopy(op)
op2.chop(threshold=0.7)
self.assertEqual(len(op2.paulis), 2,
"\n{}".format(op2.print_operators()))
gt_op2 = Operator(paulis=[])
for i in range(2, 3):
pauli_term = [coeffs[i], label_to_pauli(paulis[i])]
gt_op2 += Operator(paulis=[pauli_term])
pauli_term = [coeffs[i + 3], label_to_pauli(paulis[i + 3])]
gt_op2 += Operator(paulis=[pauli_term])
self.assertEqual(op2, gt_op2)
op3 = copy.deepcopy(op)
op3.chop(threshold=0.9)
self.assertEqual(len(op3.paulis), 0,
"\n{}".format(op3.print_operators()))
gt_op3 = Operator(paulis=[])
for i in range(3, 3):
pauli_term = [coeffs[i], label_to_pauli(paulis[i])]
gt_op3 += Operator(paulis=[pauli_term])
pauli_term = [coeffs[i + 3], label_to_pauli(paulis[i + 3])]
gt_op3 += Operator(paulis=[pauli_term])
self.assertEqual(op3, gt_op3)
def Hamiltonian_from_file(file_name):
"""Creates a matrix operator out of a file with a list
of Paulis.
Args:
file_name (str): a text file containing a list of Paulis and
coefficients.
Returns:
list: A matrix representing pauli_list
"""
with open(file_name, 'r+') as file:
ham_array = file.readlines()
ham_array = [x.strip() for x in ham_array]
pauli_list = []
for i in range(len(ham_array) // 2):
pauli = label_to_pauli(ham_array[2 * i])
Numb = float(ham_array[2 * i + 1])
pauli_list.append([Numb, pauli])
return pauli_list
def Hamiltonian_from_file(file_name):
"""Creates a matrix operator out of a file with a list
of Paulis.
Args:
file_name (str): a text file containing a list of Paulis and
coefficients.
Returns:
list: A matrix representing pauli_list
"""
with open(file_name, 'r+') as file:
ham_array = file.readlines()
ham_array = [x.strip() for x in ham_array]
pauli_list = []
for i in range(len(ham_array) // 2):
pauli = label_to_pauli(ham_array[2 * i])
Numb = float(ham_array[2 * i + 1])
pauli_list.append([Numb, pauli])
return pauli_list
def test_sumbit_multiple_circutis(self):
"""
test with single paulis
"""
num_qubits = 4
pauli_term = []
for pauli_label in itertools.product('IXYZ', repeat=num_qubits):
coeff = np.random.random(1)[0]
pauli_term.append([coeff, label_to_pauli(pauli_label)])
op = Operator(paulis=pauli_term)
depth = 1
var_form = get_variational_form_instance('RYRZ')
var_form.init_args(op.num_qubits, depth)
circuit = var_form.construct_circuit(np.array(np.random.randn(var_form.num_parameters)))
execute_config = {'shots': 1, 'skip_transpiler': False}
non_matrix_mode = op.eval('paulis', circuit, 'local_statevector_simulator', execute_config)[0]
matrix_mode = op.eval('matrix', circuit, 'local_statevector_simulator', execute_config)[0]
self.assertAlmostEqual(matrix_mode, non_matrix_mode, 6)
def construct_circuit(self, x, qr=None, inverse=False):
"""
Construct the second order expansion based on given data.
Args:
x (numpy.ndarray): 1-D to-be-transformed data.
qr (QauntumRegister): the QuantumRegister object for the circuit, if None,
generate new registers with name q.
inverse (bool): whether or not inverse the circuit
Returns:
QuantumCircuit: a quantum circuit transform data x.
"""
if not isinstance(x, np.ndarray):
raise TypeError("x must be numpy array.")
if x.ndim != 1:
raise ValueError("x must be 1-D array.")
if x.shape[0] != self._num_qubits:
raise ValueError("number of qubits and data dimension must be the same.")
if qr is None:
qc = self._construct_circuit_with_template(x)
else:
qc = QuantumCircuit(qr)
for _ in range(self._depth):
for i in range(self._num_qubits):
qc.u2(0, pi, qr[i])
for pauli in self._pauli_strings:
coeff = self._data_map_func(self._extract_data_for_rotation(pauli, x))
p = label_to_pauli(pauli)
qc += Operator.construct_evolution_circuit([[coeff, p]], 1, 1, qr)
if inverse:
qc.data = [gate.inverse() for gate in reversed(qc.data)]
return qc
def test_bksf_edge_op_aij(self):
"""Test bksf mapping, edge operator aij"""
edge_matrix = np.triu(np.ones((4, 4)))
edge_list = np.array(
np.nonzero(np.triu(edge_matrix) - np.diag(np.diag(edge_matrix))))
qterm_a01 = edge_operator_aij(edge_list, 0, 1)
qterm_a02 = edge_operator_aij(edge_list, 0, 2)
qterm_a03 = edge_operator_aij(edge_list, 0, 3)
qterm_a12 = edge_operator_aij(edge_list, 1, 2)
qterm_a13 = edge_operator_aij(edge_list, 1, 3)
qterm_a23 = edge_operator_aij(edge_list, 2, 3)
ref_qterm_a01 = Operator(paulis=[[1.0, label_to_pauli('XIIIII')]])
ref_qterm_a02 = Operator(paulis=[[1.0, label_to_pauli('ZXIIII')]])
ref_qterm_a03 = Operator(paulis=[[1.0, label_to_pauli('ZZXIII')]])
ref_qterm_a12 = Operator(paulis=[[1.0, label_to_pauli('ZZIXII')]])
ref_qterm_a13 = Operator(paulis=[[1.0, label_to_pauli('ZIZZXI')]])
ref_qterm_a23 = Operator(paulis=[[1.0, label_to_pauli('IZZZZX')]])
self.assertEqual(
qterm_a01, ref_qterm_a01,
"\n{} vs \n{}".format(qterm_a01.print_operators(),
ref_qterm_a01.print_operators()))
self.assertEqual(
qterm_a02, ref_qterm_a02,
"\n{} vs \n{}".format(qterm_a02.print_operators(),
ref_qterm_a02.print_operators()))
self.assertEqual(
qterm_a03, ref_qterm_a03,
"\n{} vs \n{}".format(qterm_a03.print_operators(),
ref_qterm_a03.print_operators()))
self.assertEqual(
qterm_a12, ref_qterm_a12,
"\n{} vs \n{}".format(qterm_a12.print_operators(),
ref_qterm_a12.print_operators()))
self.assertEqual(
qterm_a13, ref_qterm_a13,
"\n{} vs \n{}".format(qterm_a13.print_operators(),
ref_qterm_a13.print_operators()))
self.assertEqual(
qterm_a23, ref_qterm_a23,
"\n{} vs \n{}".format(qterm_a23.print_operators(),
ref_qterm_a23.print_operators()))
b.name() for b in IBMQ.backends(operational=True)
]
except KeyError as ex:
print(
'Could not find the REMOTE q_device "{}" - available remote q_devices:\n\t{}'
.format(q_device_name, remote_backends_names))
exit(1)
print('Using "{}" q_device...\n'.format(q_device.name()))
# Ignore warnings due to chopping of small imaginary part of the energy
#import warnings
#warnings.filterwarnings('ignore')
# Load the Hamiltonian into Qiskit-friendly format:
pauli_list = [[label_to_hamiltonian_coeff[label],
label_to_pauli(label)]
for label in label_to_hamiltonian_coeff]
# Calculate Exact Energy classically, to compare with quantum solution:
#
H = make_Hamiltonian(pauli_list)
classical_energy = np.amin(la.eigh(H)[0])
print(
'The exact ground state energy (the smallest eigenvalue of the Hamiltonian) is: {:.4f}'
.format(classical_energy))
# Load the ansatz function from the plug-in
ansatz_method = get_first_callable(custom_ansatz)
ansatz_function = getattr(
custom_ansatz, ansatz_method
) # ansatz_method is a string/name, ansatz_function is an imported callable
def mapping(self, map_type, threshold=0.00000001, num_workers=4):
"""
Using multiprocess to speedup the mapping, the improvement can be
observed when h2 is a non-sparse matrix.
Args:
map_type (str): case-insensitive mapping type. "jordan_wigner", "parity", "bravyi_kitaev"
threshold (float): threshold for Pauli simplification
num_workers (int): number of processes used to map.
Returns:
Operator: create an Operator object in Paulis form.
Raises:
ACQUAChemistryError: if the `map_type` can not be recognized.
"""
"""
####################################################################
############ DEFINING MAPPED FERMIONIC OPERATORS ##############
####################################################################
"""
n = self._h1.shape[0] # number of fermionic modes / qubits
map_type = map_type.lower()
if map_type == 'jordan_wigner':
a = self._jordan_wigner_mode(n)
elif map_type == 'parity':
a = self._parity_mode(n)
elif map_type == 'bravyi_kitaev':
a = self._bravyi_kitaev_mode(n)
else:
raise ACQUAChemistryError(
'Please specify the supported modes: jordan_wigner, parity, bravyi_kitaev'
)
"""
####################################################################
############ BUILDING THE MAPPED HAMILTONIAN ################
####################################################################
"""
max_workers = min(num_workers, multiprocessing.cpu_count())
pauli_list = Operator(paulis=[])
with concurrent.futures.ProcessPoolExecutor(
max_workers=max_workers) as executor:
####################### One-body #############################
futures = [
executor.submit(FermionicOperator._one_body_mapping,
self._h1[i, j], a[i], a[j], threshold)
for i, j in itertools.product(range(n), repeat=2)
if self._h1[i, j] != 0
]
for future in concurrent.futures.as_completed(futures):
result = future.result()
pauli_list += result
pauli_list.chop(threshold=threshold)
####################### Two-body #############################
futures = [
executor.submit(FermionicOperator._two_body_mapping,
self._h2[i, j, k,
m], a[i], a[j], a[k], a[m], threshold)
for i, j, k, m in itertools.product(range(n), repeat=4)
if self._h2[i, j, k, m] != 0
]
for future in concurrent.futures.as_completed(futures):
result = future.result()
pauli_list += result
pauli_list.chop(threshold=threshold)
if self._ph_trans_shift is not None:
pauli_list += Operator(paulis=[[
self._ph_trans_shift,
label_to_pauli('I' * self._h1.shape[0])
]])
return pauli_list
