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Rename exponentiate_single_term() to exponentiate_pauli_string() #100

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Jul 15, 2021
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Rename exponentiate_single_term() to exponentiate_pauli_string() #100

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4 changes: 2 additions & 2 deletions Tutorials/1-Operators-tutorial .ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -212,7 +212,7 @@
"The transformation unitary $\\hat{V}^{(\\ell)}_k$ is a one qubit gate that transforms $\\hat{X}$ or $\\hat{Y}$ into $\\hat{Z}$.\n",
"\n",
"\n",
"In QForte this requires one to pass a coefficient and q `Circuit` to the utility function `exponentiate_single_term().`\n",
"In QForte this requires one to pass a coefficient and q `Circuit` to the utility function `exponentiate_pauli_string().`\n",
"\n",
"> Build the circuit corresponding to $\\exp(-i 0.5 \\hat{X}_3 \\hat{Z}_2 \\hat{Z}_1 \\hat{Z}_0)$ "
]
Expand Down Expand Up @@ -250,7 +250,7 @@
"factor = -1.0j * theta\n",
"\n",
"# Construct the unitary for the exonential\n",
"Uexp, phase = exponentiate_single_term(factor, circ)\n",
"Uexp, phase = exponentiate_pauli_string(factor, circ)\n",
"print('\\n The exponential unitary circuit: \\n',Uexp)"
]
},
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9 changes: 4 additions & 5 deletions src/qforte/utils/exponentiate.py
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Expand Up @@ -5,25 +5,24 @@
import qforte
import numpy as np

def exponentiate_single_term(coefficient, term, Use_cRz=False, ancilla_idx=None, Use_open_cRz=False):
def exponentiate_pauli_string(coefficient, term, Use_cRz=False, ancilla_idx=None, Use_open_cRz=False):
"""
returns the exponential of an string of Pauli operators multiplied by an imaginary coefficient

exp(coefficient * term)

Parameters
----------
:param coefficient: float
:param coefficient: complex
an imaginary coefficient that multiplies the Pauli string
:param term: Circuit
a Pauli string to be exponentiated
"""
# This function assumes that the factor is imaginary. The following tests for it.
if np.abs(np.real(coefficient)) > 1.0e-16:
print("exp factor: ", coefficient)
raise ValueError('exponentiate_single_term() called with a real coefficient')
raise ValueError(f'exponentiate_pauli_string() called with a real coefficient {coefficient}')

# If the Pauli string has no terms this is just a phase factor
# If the Pauli string has no terms this is just a phase factor times the identity circuit
if term.size() == 0:
return (qforte.Circuit(), np.exp(coefficient))

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12 changes: 6 additions & 6 deletions src/qforte/utils/trotterization.py
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Expand Up @@ -28,7 +28,7 @@ def trotterize(operator, factor=1.0, trotter_number=1, trotter_order=1):
if (trotter_number == 1) and (trotter_order == 1):
#loop over terms in operator
for term in operator.terms():
term_generator, phase = qforte.exponentiate_single_term(factor*term[0],term[1])
term_generator, phase = qforte.exponentiate_pauli_string(factor*term[0],term[1])
for gate in term_generator.gates():
troterized_operator.add(gate)
total_phase *= phase
Expand All @@ -45,7 +45,7 @@ def trotterize(operator, factor=1.0, trotter_number=1, trotter_order=1):
ho_op.add( factor * term[0] / float(trotter_number) , term[1])

for trot_term in ho_op.terms():
term_generator, phase = qforte.exponentiate_single_term(trot_term[0],trot_term[1])
term_generator, phase = qforte.exponentiate_pauli_string(trot_term[0],trot_term[1])
for gate in term_generator.gates():
troterized_operator.add(gate)
total_phase *= phase
Expand Down Expand Up @@ -82,13 +82,13 @@ def trotterize_w_cRz(operator, ancilla_qubit_idx, factor=1.0, Use_open_cRz=False
#loop over terms in operator
if(Use_open_cRz):
for term in operator.terms():
term_generator, phase = qforte.exponentiate_single_term(factor*term[0],term[1], Use_cRz=True, ancilla_idx=ancilla_qubit_idx, Use_open_cRz=True)
term_generator, phase = qforte.exponentiate_pauli_string(factor*term[0],term[1], Use_cRz=True, ancilla_idx=ancilla_qubit_idx, Use_open_cRz=True)
for gate in term_generator.gates():
troterized_operator.add(gate)
total_phase *= phase
else:
for term in operator.terms():
term_generator, phase = qforte.exponentiate_single_term(factor*term[0],term[1], Use_cRz=True, ancilla_idx=ancilla_qubit_idx)
term_generator, phase = qforte.exponentiate_pauli_string(factor*term[0],term[1], Use_cRz=True, ancilla_idx=ancilla_qubit_idx)
for gate in term_generator.gates():
troterized_operator.add(gate)
total_phase *= phase
Expand All @@ -104,13 +104,13 @@ def trotterize_w_cRz(operator, ancilla_qubit_idx, factor=1.0, Use_open_cRz=False

if(Use_open_cRz):
for trot_term in ho_op.terms():
term_generator, phase = qforte.exponentiate_single_term(trot_term[0],trot_term[1], Use_cRz=True, ancilla_idx=ancilla_qubit_idx, Use_open_cRz=True)
term_generator, phase = qforte.exponentiate_pauli_string(trot_term[0],trot_term[1], Use_cRz=True, ancilla_idx=ancilla_qubit_idx, Use_open_cRz=True)
for gate in term_generator.gates():
troterized_operator.add(gate)
total_phase *= phase
else:
for trot_term in ho_op.terms():
term_generator, phase = qforte.exponentiate_single_term(trot_term[0],trot_term[1], Use_cRz=True, ancilla_idx=ancilla_qubit_idx)
term_generator, phase = qforte.exponentiate_pauli_string(trot_term[0],trot_term[1], Use_cRz=True, ancilla_idx=ancilla_qubit_idx)
for gate in term_generator.gates():
troterized_operator.add(gate)
total_phase *= phase
Expand Down