PauliZExpansion
class PauliZExpansion(feature_dimension, depth=2, entangler_map=None, entanglement='full', z_order=2, data_map_func=<function self_product>)
DEPRECATED. The Pauli Z Expansion feature map.
This is a sub-class of the general PauliExpansion but where the pauli string is fixed to only contain Z and where paulis is now created for the superclass as per the given z_order. So with default of 2 this creates [‘Z’, ‘ZZ’] which also happens to be the default of the superclass. A z_order of 3 would be [‘Z’, ‘ZZ’, ‘ZZZ’] and so on.
Parameters
- feature_dimension (
int) – The number of features - depth (
int) – The number of repeated circuits. Defaults to 2, has a minimum value of 1. - entangler_map (
Optional[List[List[int]]]) – Describes the connectivity of qubits, each list in the overall list describes [source, target]. Defaults toNonewhere the map is created as per entanglement parameter. Note that the order in the list is the order of applying the two-qubit gate. - entanglement (
str) – (‘full’ | ‘linear’), generate the qubit connectivity by a predefined topology. Defaults to full which connects every qubit to each other. Linear connects each qubit to the next. - z_order (
int) – z order, has a min. value of 1. Creates paulis for superclass based on the z order value, e.g. 3 would result in [‘Z’, ‘ZZ’, ‘ZZZ’] where the paulis contains strings of Z up to length of z_order - data_map_func (
Callable[[ndarray],float]) – A mapping function for data x which can be supplied to override the default mapping fromself_product().
Attributes
feature_dimension
returns feature dimension
num_qubits
returns number of qubits
support_parameterized_circuit
returns whether or not the sub-class support parameterized circuit
Methods
construct_circuit
PauliZExpansion.construct_circuit(x, qr=None, inverse=False)
Construct the second order expansion based on given data.
Parameters
- x (Union(numpy.ndarray, list[Parameter], ParameterVector)) – 1-D to-be-transformed data.
- qr (QuantumRegister, optional) – the QuantumRegister object for the circuit, if None, generate new registers with name q.
- inverse (bool, optional) – whether or not inverse the circuit
Returns
a quantum circuit transform data x.
Return type
Raises
- TypeError – invalid input
- ValueError – invalid input
get_entangler_map
static PauliZExpansion.get_entangler_map(map_type, num_qubits)
get entangle map
validate_entangler_map
static PauliZExpansion.validate_entangler_map(entangler_map, num_qubits)
validate entangler map