def pair_unitary(a, b):
'''
Accepts a BinaryPauliString.
Return the paired unitary 1/sqrt(2) (a + b) in qubit hamiltonian.
'''
a = QubitHamiltonian.from_paulistrings(a.to_pauli_strings())
b = QubitHamiltonian.from_paulistrings(b.to_pauli_strings())
return (1 / 2) ** (1 / 2) * (a + b)
def test_paulistring_conversion():
X1 = QubitHamiltonian.from_string("X0", openfermion_format=True)
X2 = paulis.X(0)
keys = [i for i in X2.keys()]
pwx = PauliString.from_openfermion(key=keys[0], coeff=X2[keys[0]])
X3 = QubitHamiltonian.from_paulistrings(pwx)
assert (X1 == X2)
assert (X2 == X3)
H = paulis.X(0) * paulis.Y(1) * paulis.Z(2) + paulis.X(3) * paulis.Y(
4) * paulis.Z(5)
PS = []
for key, value in H.items():
PS.append(PauliString.from_openfermion(key, value))
PS2 = H.paulistrings
assert (PS == PS2)
H = make_random_pauliword(complex=True)
for i in range(5):
H += make_random_pauliword(complex=True)
PS = []
for key, value in H.items():
PS.append(PauliString.from_openfermion(key, value))
PS2 = H.paulistrings
assert (PS == PS2)
def __init__(self,
paulistring: PauliString,
angle: float,
control: typing.List[int] = None):
super().__init__(eigenvalues_magnitude=0.5,
name="Exp-Pauli",
target=tuple(t for t in paulistring.keys()),
control=control,
parameter=angle)
self.paulistring = paulistring
self.generator = QubitHamiltonian.from_paulistrings(paulistring)
self.finalize()
def to_qubit_hamiltonian(self):
qub_ham = QubitHamiltonian()
for p in self.binary_terms:
qub_ham += QubitHamiltonian.from_paulistrings(p.to_pauli_strings())
return qub_ham