def __init__(self,
num_qubits,
depth=3,
entangler_map=None,
entanglement='full',
initial_state=None,
entanglement_gate='cz',
skip_unentangled_qubits=False,
skip_final_ry=False):
"""Constructor.
Args:
num_qubits (int) : number of qubits
depth (int) : number of rotation layers
entangler_map (list[list]): describe the connectivity of qubits, each list describes
[source, target], or None for full entanglement.
Note that the order is the list is the order of
applying the two-qubit gate.
entanglement (str): 'full', 'linear' or 'sca'
initial_state (InitialState): an initial state object
entanglement_gate (str): cz or cx
skip_unentangled_qubits (bool): skip the qubits not in the entangler_map
skip_final_ry (bool): skip the final layer of Y rotations
"""
self.validate(locals())
super().__init__()
self._num_qubits = num_qubits
self._depth = depth
self._entanglement = entanglement
if entangler_map is None:
self._entangler_map = VariationalForm.get_entangler_map(
entanglement, num_qubits)
else:
self._entangler_map = VariationalForm.validate_entangler_map(
entangler_map, num_qubits)
# determine the entangled qubits
all_qubits = []
for src, targ in self._entangler_map:
all_qubits.extend([src, targ])
self._entangled_qubits = sorted(list(set(all_qubits)))
self._initial_state = initial_state
self._entanglement_gate = entanglement_gate
self._skip_unentangled_qubits = skip_unentangled_qubits
self._skip_final_ry = skip_final_ry
# for the first layer
self._num_parameters = len(self._entangled_qubits) if self._skip_unentangled_qubits \
else self._num_qubits
# for repeated block (minus one ry layer if we skip the last)
self._num_parameters += len(self._entangled_qubits) * (depth - 1) if skip_final_ry \
else len(self._entangled_qubits) * depth
# CRx gates have an additional parameter per entanglement
if entanglement_gate == 'crx':
self._num_parameters += len(self._entangler_map) * depth
self._bounds = [(-np.pi, np.pi)] * self._num_parameters
def __init__(self,
num_qubits,
depth=3,
entangler_map=None,
entanglement='full',
initial_state=None):
"""Constructor.
Args:
num_qubits (int) : number of qubits
depth (int) : number of rotation layers
entangler_map (list[list]): describe the connectivity of qubits, each list describes
[source, target], or None for full entanglement.
Note that the order is the list is the order of
applying the two-qubit gate.
entanglement (str): 'full' or 'linear'
initial_state (InitialState): an initial state object
"""
self.validate(locals())
super().__init__()
self._num_qubits = num_qubits
self._depth = depth
if entangler_map is None:
self._entangler_map = VariationalForm.get_entangler_map(
entanglement, num_qubits)
else:
self._entangler_map = VariationalForm.validate_entangler_map(
entangler_map, num_qubits)
self._initial_state = initial_state
self._num_parameters = num_qubits + depth * \
(num_qubits + len(self._entangler_map))
self._bounds = [(-np.pi, np.pi)] * self._num_parameters
def __init__(self, num_qubits: Optional[int] = None, reps: int = 1, ladder: bool = False,
excitations: Optional[List[List[int]]] = None,
entanglement: Union[str, List[int]] = 'full',
initial_state: Optional[InitialState] = None) -> None:
"""
Args:
num_qubits: number of qubits
reps: number of replica of basic module
ladder: use ladder of CNOTs between to indices in the entangling block
excitations: indices corresponding to the excitations to include in the circuit
entanglement: physical connections between the qubits
initial_state: an initial state object
"""
super().__init__()
self._num_qubits = num_qubits
self._reps = reps
self._excitations = None
self._entangler_map = None
self._initial_state = None
self._ladder = ladder
self._num_parameters = len(excitations) * reps
self._excitations = excitations
self._bounds = [(-np.pi, np.pi)] * self._num_parameters
self._num_qubits = num_qubits
if isinstance(entanglement, str):
self._entangler_map = VariationalForm.get_entangler_map(entanglement, num_qubits)
else:
self._entangler_map = VariationalForm.validate_entangler_map(entanglement, num_qubits)
self._initial_state = initial_state
self._support_parameterized_circuit = True
def __init__(self,
num_qubits,
depth=3,
entangler_map=None,
entanglement='full',
initial_state=None):
"""Constructor.
Args:
num_qubits (int) : number of qubits
depth (int) : number of rotation layers
entangler_map (dict) : dictionary of entangling gates, in the format
{ source : [list of targets] },
or None for full entanglement.
entanglement (str): 'full' or 'linear'
initial_state (InitialState): an initial state object
"""
self.validate(locals())
super().__init__()
self._num_parameters = num_qubits * (depth + 1) * 2
self._bounds = [(-np.pi, np.pi)] * self._num_parameters
self._num_qubits = num_qubits
self._depth = depth
if entangler_map is None:
self._entangler_map = VariationalForm.get_entangler_map(
entanglement, num_qubits)
else:
self._entangler_map = VariationalForm.validate_entangler_map(
entangler_map, num_qubits)
self._initial_state = initial_state
def __init__(self,
num_qubits,
depth=3,
entangler_map=None,
entanglement='full',
initial_state=None,
skip_unentangled_qubits=False):
"""Constructor.
Args:
num_qubits (int) : number of qubits
depth (int) : number of rotation layers
entangler_map (list[list]): describe the connectivity of qubits, each list describes
[source, target], or None for full entanglement.
Note that the order is the list is the order of
applying the two-qubit gate.
entanglement (str): 'full' or 'linear'
initial_state (InitialState): an initial state object
skip_unentangled_qubits (bool): skip the qubits not in the entangler_map
"""
validate(locals(), self._INPUT_SCHEMA)
super().__init__()
self._num_qubits = num_qubits
self._depth = depth
if entangler_map is None:
self._entangler_map = VariationalForm.get_entangler_map(
entanglement, num_qubits)
else:
self._entangler_map = VariationalForm.validate_entangler_map(
entangler_map, num_qubits)
# determine the entangled qubits
all_qubits = []
for src, targ in self._entangler_map:
all_qubits.extend([src, targ])
self._entangled_qubits = sorted(list(set(all_qubits)))
self._initial_state = initial_state
self._skip_unentangled_qubits = skip_unentangled_qubits
# for the first layer
self._num_parameters = len(self._entangled_qubits) if self._skip_unentangled_qubits \
else self._num_qubits
# for repeated block
self._num_parameters += (len(self._entangled_qubits) +
len(self._entangler_map)) * depth
self._bounds = [(-np.pi, np.pi)] * self._num_parameters
self._support_parameterized_circuit = True
def __init__(self,
num_dis: int = 4,
num_con: int = 2,
depth: int = 4,
entangler_map: Optional[List[List[int]]] = None,
entanglement: str = 'full',
initial_state: Optional[InitialState] = None,
entanglement_gate: str = 'cz',
skip_unentangled_qubits: bool = False) -> None:
"""
Args:
num_qubits: Number of qubits, has a minimum value of 1.
depth: Number of rotation layers, has a minimum value of 1.
entangler_map: Describe the connectivity of qubits, each list pair describes
[source, target], or None for as defined by `entanglement`.
Note that the order is the list is the order of applying the two-qubit gate.
entanglement: ('full' | 'linear') overridden by 'entangler_map` if its
provided. 'full' is all-to-all entanglement, 'linear' is nearest-neighbor.
initial_state: An initial state object
entanglement_gate: ('cz' | 'cx')
skip_unentangled_qubits: Skip the qubits not in the entangler_map
"""
warnings.warn(
'The qiskit.aqua.components.variational_forms.RYRZ object is deprecated as '
'of 0.7.0 and will be removed no sooner than 3 months after the release. You '
'should use qiskit.circuit.library.EfficientSU2 (uses CX entangling) or '
'qiskit.circuit.library.TwoLocal instead.',
DeprecationWarning,
stacklevel=2)
num_qubits = num_con + num_dis
validate_min('num_qubits', num_qubits, 1)
validate_min('depth', depth, 1)
validate_in_set('entanglement', entanglement, {'full', 'linear'})
validate_in_set('entanglement_gate', entanglement_gate, {'cz', 'cx'})
super().__init__()
self._num_qubits = num_qubits
self._num_con = num_con
self._num_dis = num_dis
self._depth = depth
if entangler_map is None:
self._entangler_map = VariationalForm.get_entangler_map(
entanglement, num_qubits)
else:
self._entangler_map = VariationalForm.validate_entangler_map(
entangler_map, num_qubits)
# determine the entangled qubits
all_qubits = []
for src, targ in self._entangler_map:
all_qubits.extend([src, targ])
self._entangled_qubits = sorted(list(set(all_qubits)))
self._initial_state = initial_state
self._entanglement_gate = entanglement_gate
self._skip_unentangled_qubits = skip_unentangled_qubits
# for the first layer
self._num_parameters = len(self._entangled_qubits) * 2 if self._skip_unentangled_qubits \
else self._num_qubits * 2
# for repeated block
self._num_parameters += len(self._entangled_qubits) * depth * 2
self._support_parameterized_circuit = True
# Feature Encoder params
# U3(theta1, theta2, 0)
self._num_parameters += 16 * self._num_dis
self._pre_params = 16 * self._num_dis
self._bounds = [(-np.pi, np.pi)] * self._num_parameters
def construct_circuit(self, parameters, q=None):
"""
Construct the variational form, given its parameters.
Args:
parameters (numpy.ndarray): circuit parameters.
q (QuantumRegister): Quantum Register for the circuit.
Returns:
QuantumCircuit: a quantum circuit with given `parameters`
Raises:
ValueError: the number of parameters is incorrect.
"""
if len(parameters) != self._num_parameters:
raise ValueError('The number of parameters has to be {}'.format(
self._num_parameters))
if q is None:
q = QuantumRegister(self._num_qubits, name='q')
if self._initial_state is not None:
circuit = self._initial_state.construct_circuit('circuit', q)
else:
circuit = QuantumCircuit(q)
param_idx = 0
for qubit in range(self._num_qubits):
if not self._skip_unentangled_qubits or qubit in self._entangled_qubits:
circuit.u3(parameters[param_idx], 0.0, 0.0, q[qubit]) # ry
param_idx += 1
for block in range(self._depth):
circuit.barrier(q)
if self._entanglement == 'sca':
self._entangler_map = VariationalForm.get_entangler_map(
self._entanglement, self._num_qubits, offset=block)
for src, targ in self._entangler_map:
if self._entanglement_gate == 'cz':
circuit.u2(0.0, np.pi, q[targ]) # h
circuit.cx(q[src], q[targ])
circuit.u2(0.0, np.pi, q[targ]) # h
elif self._entanglement_gate == 'crx':
circuit.cu3(parameters[param_idx], -np.pi / 2, np.pi / 2,
q[src], q[targ]) # crx
param_idx += 1
else:
circuit.cx(q[src], q[targ])
# Skip the final RY layer if it is specified and we reached the
# last block
if not self._skip_final_ry or block != self._depth - 1:
circuit.barrier(q)
for qubit in self._entangled_qubits:
circuit.u3(parameters[param_idx], 0.0, 0.0, q[qubit]) # ry
param_idx += 1
circuit.barrier(q)
return circuit