def from_single_map(
pauli_map_to: Optional[Dict[Pauli, Tuple[Pauli, bool]]] = None,
*,
x_to: Optional[Tuple[Pauli, bool]] = None,
y_to: Optional[Tuple[Pauli, bool]] = None,
z_to: Optional[Tuple[Pauli,
bool]] = None) -> 'SingleQubitCliffordGate':
"""Returns a SingleQubitCliffordGate for the
specified transform with a 90 or 180 degree rotation.
The arguments are exclusive, only one may be specified.
Args:
pauli_map_to: A dictionary with a single key value pair describing
the transform.
x_to: The transform from cirq.X
y_to: The transform from cirq.Y
z_to: The transform from cirq.Z
"""
rotation_map = SingleQubitCliffordGate._validate_map_input(
1, pauli_map_to, x_to=x_to, y_to=y_to, z_to=z_to)
(trans_from, (trans_to, flip)), = tuple(rotation_map.items())
if trans_from == trans_to:
trans_from2 = Pauli.by_relative_index(trans_to, 1) # 1 or 2 work
trans_to2 = Pauli.by_relative_index(trans_from, 1)
flip2 = False
else:
trans_from2 = trans_to
trans_to2 = trans_from
flip2 = not flip
rotation_map[trans_from2] = PauliTransform(trans_to2, flip2)
return SingleQubitCliffordGate.from_double_map(
cast(Dict[Pauli, Tuple[Pauli, bool]], rotation_map))
def from_pauli(pauli: Pauli, sqrt: bool = False) -> 'SingleQubitCliffordGate':
prev_pauli = Pauli.by_relative_index(pauli, -1)
next_pauli = Pauli.by_relative_index(pauli, 1)
if sqrt:
rotation_map = {
prev_pauli: (next_pauli, True),
pauli: (pauli, False),
next_pauli: (prev_pauli, False),
}
else:
rotation_map = {
prev_pauli: (prev_pauli, True),
pauli: (pauli, False),
next_pauli: (next_pauli, True),
}
return SingleQubitCliffordGate.from_clifford_tableau(_to_clifford_tableau(rotation_map))
def from_pauli(pauli: Pauli,
sqrt: bool = False) -> 'SingleQubitCliffordGate':
prev_pauli = Pauli.by_relative_index(pauli, -1)
next_pauli = Pauli.by_relative_index(pauli, 1)
if sqrt:
rotation_map = {prev_pauli: PauliTransform(next_pauli, True),
pauli: PauliTransform(pauli, False),
next_pauli: PauliTransform(prev_pauli, False)}
else:
rotation_map = {prev_pauli: PauliTransform(prev_pauli, True),
pauli: PauliTransform(pauli, False),
next_pauli: PauliTransform(next_pauli, True)}
inverse_map = {to: PauliTransform(frm, flip)
for frm, (to, flip) in rotation_map.items()}
return SingleQubitCliffordGate(_rotation_map=rotation_map,
_inverse_map=inverse_map)
