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CircuitStateFn

class CircuitStateFn(primitive=None, coeff=1.0, is_measurement=False, from_operator=False)[código fonte]

Bases: StateFn

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.

Parâmetros
  • primitive (Union[QuantumCircuit, Instruction, None]) – The QuantumCircuit (or Instruction, which will be converted) which defines the behavior of the underlying function.

  • coeff (Union[complex, ParameterExpression]) – A coefficient multiplying the state function.

  • is_measurement (bool) – Whether the StateFn is a measurement operator.

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

Levanta

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.

Tipo de retorno

Union[complex, ParameterExpression]

instance_id

Return the unique instance id.

Tipo de retorno

int

is_measurement

Whether the StateFn object is a measurement Operator.

Tipo de retorno

bool

num_qubits
Tipo de retorno

int

parameters
primitive: QuantumCircuit

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

settings

Return settings.

Tipo de retorno

Dict