CircuitStateFn

class CircuitStateFn(*args, **kwargs)

Bases : StateFn

Deprecated: A class for state functions and measurements which are defined by the action of a QuantumCircuit starting from |0⟩, and stored using Terra’s QuantumCircuit class.

Obsolète depuis la version 0.24.0: The class qiskit.opflow.state_fns.circuit_state_fn.CircuitStateFn is deprecated as of qiskit-terra 0.24.0. It will be removed no earlier than 3 months after the release date. For code migration guidelines, visit https://qisk.it/opflow_migration.

Paramètres

• primitive – The QuantumCircuit (or Instruction, which will be converted) which defines the behavior of the underlying function.

• coeff – A coefficient multiplying the state function.

• is_measurement – Whether the StateFn is a measurement operator.

• from_operator – if True the StateFn is derived from OperatorStateFn. (Default: False)

Lève

TypeError – Unsupported primitive, or primitive has ClassicalRegisters.

Methods Defined Here

add	Return Operator addition of self and other, overloaded by +.
adjoint	Return a new Operator equal to the Operator's adjoint (conjugate transpose), overloaded by ~.
assign_parameters	Binds scalar values to any Terra Parameters in the coefficients or primitives of the Operator, or substitutes one Parameter for another.
compose	Composition (Linear algebra-style: A@B(x) = A(B(x))) is not well defined for states in the binary function model, but is well defined for measurements.
eval	Evaluate the Operator's underlying function, either on a binary string or another Operator.
from_dict	Construct the CircuitStateFn from a dict mapping strings to probability densities.
from_vector	Construct the CircuitStateFn from a vector representing the statevector.
permute	Permute the qubits of the circuit.
primitive_strings	Return a set of strings describing the primitives contained in the Operator.
reduce	Try collapsing the Operator structure, usually after some type of conversion, e.g.
sample	Sample the state function as a normalized probability distribution.
tensor	Return tensor product between self and other, overloaded by ^.
to_circuit	Return QuantumCircuit representing StateFn
to_circuit_op	Return StateFnCircuit corresponding to this StateFn.
to_density_matrix	Return numpy matrix of density operator, warn if more than 16 qubits to force the user to set massive=True if they want such a large matrix.
to_instruction	Return Instruction corresponding to primitive.
to_matrix	Return NumPy representation of the Operator.

Attributes

INDENTATION = '  '

coeff

A coefficient by which the state function is multiplied.

instance_id

Return the unique instance id.

is_measurement

Whether the StateFn object is a measurement Operator.

num_qubits

parameters

primitive: QuantumCircuit

The primitive which defines the behavior of the underlying State function.

settings

Return settings.