def __init__(self,
num_qubits: int,
state: str = 'zero',
state_vector: Optional[Union[np.ndarray, StateFn]] = None,
circuit: Optional[QuantumCircuit] = None) -> None:
"""
Args:
num_qubits: Number of qubits, has a minimum value of 1.
state: Use a predefined state of ('zero' | 'uniform' | 'random')
state_vector: An optional vector of ``complex`` or ``float`` representing the state as
a probability distribution which will be normalized to a total probability of 1
when initializing the qubits. The length of the vector must be :math:`2^q`, where
:math:`q` is the *num_qubits* value. When provided takes precedence over *state*.
circuit: A quantum circuit for the desired initial state. When provided takes
precedence over both *state_vector* and *state*.
Raises:
AquaError: invalid input
"""
validate_min('num_qubits', num_qubits, 1)
validate_in_set('state', state, {'zero', 'uniform', 'random'})
super().__init__()
self._num_qubits = num_qubits
self._state = state
size = np.power(2, self._num_qubits)
self._circuit = None
if isinstance(state_vector, StateFn):
state_vector = state_vector.to_matrix()
# pylint: disable=comparison-with-callable
if circuit is not None:
if circuit.width() != num_qubits:
logger.warning('The specified num_qubits and '
'the provided custom circuit do not match.')
self._circuit = convert_to_basis_gates(circuit)
if state_vector is not None:
self._state = None
self._state_vector = None
logger.warning(
'The provided state_vector is ignored in favor of '
'the provided custom circuit.')
else:
if state_vector is None:
if self._state == 'zero':
self._state_vector = np.array([1.0] + [0.0] * (size - 1))
elif self._state == 'uniform':
self._state_vector = np.array([1.0 / np.sqrt(size)] * size)
elif self._state == 'random':
self._state_vector = normalize_vector(
aqua_globals.random.random(size))
else:
raise AquaError('Unknown state {}'.format(self._state))
else:
if len(state_vector) != np.power(2, self._num_qubits):
raise AquaError(
'The state vector length {} is incompatible with '
'the number of qubits {}'.format(
len(state_vector), self._num_qubits))
self._state_vector = normalize_vector(state_vector)
self._state = None
def __init__(self,
num_qubits,
state="zero",
state_vector=None,
circuit=None):
"""Constructor.
Args:
num_qubits (int): number of qubits
state (str): `zero`, `uniform` or `random`
state_vector (numpy.ndarray): customized vector
circuit (QuantumCircuit): the actual custom circuit for the desired initial state
Raises:
AquaError: invalid input
"""
# pylint: disable=comparison-with-callable
loc = locals().copy()
# since state_vector is a numpy array of complex numbers which aren't json valid,
# remove it from validation
del loc['state_vector']
self.validate(loc)
super().__init__()
self._num_qubits = num_qubits
self._state = state
size = np.power(2, self._num_qubits)
self._circuit = None
if circuit is not None:
if circuit.width() != num_qubits:
logger.warning('The specified num_qubits and '
'the provided custom circuit do not match.')
self._circuit = convert_to_basis_gates(circuit)
if state_vector is not None:
self._state = None
self._state_vector = None
logger.warning(
'The provided state_vector is ignored in favor of '
'the provided custom circuit.')
else:
if state_vector is None:
if self._state == 'zero':
self._state_vector = np.array([1.0] + [0.0] * (size - 1))
elif self._state == 'uniform':
self._state_vector = np.array([1.0 / np.sqrt(size)] * size)
elif self._state == 'random':
self._state_vector = normalize_vector(
aqua_globals.random.rand(size))
else:
raise AquaError('Unknown state {}'.format(self._state))
else:
if len(state_vector) != np.power(2, self._num_qubits):
raise AquaError(
'The state vector length {} is incompatible with '
'the number of qubits {}'.format(
len(state_vector), self._num_qubits))
self._state_vector = normalize_vector(state_vector)
self._state = None
def __init__(self,
num_qubits: int,
state: str = 'zero',
state_vector: Optional[np.ndarray] = None,
circuit: Optional[QuantumCircuit] = None) -> None:
"""Constructor.
Args:
num_qubits: number of qubits, has a min. value of 1.
state: `zero`, `uniform` or `random`
state_vector: customized vector
circuit: the actual custom circuit for the desired initial state
Raises:
AquaError: invalid input
"""
validate_min('num_qubits', num_qubits, 1)
validate_in_set('state', state, {'zero', 'uniform', 'random'})
super().__init__()
self._num_qubits = num_qubits
self._state = state
size = np.power(2, self._num_qubits)
self._circuit = None
if circuit is not None:
if circuit.width() != num_qubits:
logger.warning('The specified num_qubits and '
'the provided custom circuit do not match.')
self._circuit = convert_to_basis_gates(circuit)
if state_vector is not None:
self._state = None
self._state_vector = None
logger.warning(
'The provided state_vector is ignored in favor of '
'the provided custom circuit.')
else:
if state_vector is None:
if self._state == 'zero':
self._state_vector = np.array([1.0] + [0.0] * (size - 1))
elif self._state == 'uniform':
self._state_vector = np.array([1.0 / np.sqrt(size)] * size)
elif self._state == 'random':
self._state_vector = normalize_vector(
aqua_globals.random.rand(size))
else:
raise AquaError('Unknown state {}'.format(self._state))
else:
if len(state_vector) != np.power(2, self._num_qubits):
raise AquaError(
'The state vector length {} is incompatible with '
'the number of qubits {}'.format(
len(state_vector), self._num_qubits))
self._state_vector = normalize_vector(state_vector)
self._state = None
def __init__(self, state_vector):
"""Constructor.
Args:
state_vector: vector representation of the desired quantum state
"""
if not is_power_of_2(len(state_vector)):
raise AquaError('The length of the input state vector needs to be a power of 2.')
self._num_qubits = log2(len(state_vector))
self._state_vector = normalize_vector(state_vector)
def __init__(self, state_vector):
"""Constructor.
Args:
state_vector (numpy.ndarray): vector representation of the desired quantum state
Raises:
AquaError: invalid input
"""
warnings.warn('The StateVectorCircuit class is deprecated as of Qiskit Aqua 0.9.0 and will '
'be removed no earlier than 3 months after the release. If you need to '
'initialize a circuit, use the QuantumCircuit.initialize or '
'QuantumCircuit.isometry methods. For a parameterized initialization, try '
'the qiskit.ml.circuit.library.RawFeatureVector class.',
DeprecationWarning, stacklevel=2)
if not is_power_of_2(len(state_vector)):
raise AquaError('The length of the input state vector needs to be a power of 2.')
self._num_qubits = log2(len(state_vector))
self._state_vector = normalize_vector(state_vector)