def construct_circuit(self, mode, register=None):
"""
Construct the statevector of desired initial state.
Args:
mode (string): `vector` or `circuit`. The `vector` mode produces the vector.
While the `circuit` constructs the quantum circuit corresponding that
vector.
register (QuantumRegister): register for circuit construction.
Returns:
QuantumCircuit or numpy.ndarray: statevector.
Raises:
AquaError: when mode is not 'vector' or 'circuit'.
"""
if mode == 'vector':
if self._state_vector is None:
if self._circuit is not None:
self._state_vector = np.asarray(
q_execute(
self._circuit,
BasicAer.get_backend('statevector_simulator')).
result().get_statevector(self._circuit))
return self._state_vector
elif mode == 'circuit':
if self._circuit is None:
if register is None:
register = QuantumRegister(self._num_qubits, name='q')
# create emtpy quantum circuit
circuit = QuantumCircuit()
# if register is actually a list of qubits
if type(register) is list:
# loop over all qubits and add the required registers
for q in register:
if not circuit.has_register(q[0]):
circuit.add_register(q[0])
else:
# if an actual register is given, add it
circuit.add_register(register)
if self._state is None or self._state == 'random':
svc = StateVectorCircuit(self._state_vector)
svc.construct_circuit(circuit, register)
elif self._state == 'zero':
pass
elif self._state == 'uniform':
for i in range(self._num_qubits):
circuit.u2(0.0, np.pi, register[i])
else:
pass
self._circuit = circuit
return self._circuit.copy()
else:
raise AquaError('Mode should be either "vector" or "circuit"')
def construct_circuit(self, mode='circuit', register=None):
# pylint: disable=import-outside-toplevel
from qiskit import BasicAer
if mode == 'vector':
if self._state_vector is None:
if self._circuit is not None:
self._state_vector = np.asarray(
q_execute(
self._circuit,
BasicAer.get_backend('statevector_simulator')).
result().get_statevector(self._circuit))
return self._state_vector
elif mode == 'circuit':
if self._circuit is None:
# create empty quantum circuit
circuit = QuantumCircuit()
if register is None:
register = QuantumRegister(self._num_qubits, name='q')
if isinstance(register, QuantumRegister):
circuit.add_register(register)
elif isinstance(register, list):
for q in register:
if isinstance(q, Qubit):
if not circuit.has_register(q.register):
circuit.add_register(q.register)
else:
raise AquaError('Unexpected qubit type {}.'.format(
type(q)))
else:
raise AquaError('Unexpected register type {}.'.format(
type(register)))
if self._state is None or self._state == 'random':
svc = StateVectorCircuit(self._state_vector)
svc.construct_circuit(circuit=circuit, register=register)
elif self._state == 'uniform':
for i in range(self._num_qubits):
circuit.u(np.pi / 2, 0.0, np.pi, register[i])
elif self._state == 'zero':
pass
else:
AquaError('Unexpected state mode {}.'.format(self._state))
self._circuit = circuit
return self._circuit.copy()
else:
raise AquaError('Mode should be either "vector" or "circuit"')
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-encoded data.
qr (QauntumRegister): the QuantumRegister object for the circuit, if None,
generate new registers with name q.
inverse (bool): inverse
Returns:
QuantumCircuit: a quantum circuit transform data x.
Raises:
TypeError: invalid input
ValueError: invalid input
"""
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._feature_dimension:
raise ValueError("Unexpected feature vector dimension.")
state_vector = np.pad(x, (0, (1 << self.num_qubits) - len(x)),
'constant')
svc = StateVectorCircuit(state_vector)
return svc.construct_circuit(register=qr)
def reset_qc(self, statevector):
st = StateVectorCircuit(statevector)
self.qc = st.construct_circuit(register=self.q)
def reset_qc(self, statevector):
st = StateVectorCircuit(statevector)
self.qc = st.construct_circuit()
self.q = self.qc.qubits[0]
self.a = self.qc.qubits[1]
self.b = self.qc.qubits[2]