Operator

class Operator(data, input_dims=None, output_dims=None)

Bases: LinearOp

Matrix operator class

This represents a matrix operator \(M\) that will evolve() a Statevector \(|\psi\rangle\) by matrix-vector multiplication

\[|\psi\rangle \mapsto M|\psi\rangle,\]

and will evolve() a DensityMatrix \(\rho\) by left and right multiplication

\[\rho \mapsto M \rho M^\dagger.\]

Initialize an operator object.

Parámetros

• data (QuantumCircuit or Operation or BaseOperator or matrix) – data to initialize operator.

• input_dims (tuple) – the input subsystem dimensions. [Default: None]

• output_dims (tuple) – the output subsystem dimensions. [Default: None]

Muestra

QiskitError – if input data cannot be initialized as an operator.

Additional Information:

If the input or output dimensions are None, they will be automatically determined from the input data. If the input data is a Numpy array of shape (2**N, 2**N) qubit systems will be used. If the input operator is not an N-qubit operator, it will assign a single subsystem with dimension specified by the shape of the input.

Methods

adjoint	Return the adjoint of the Operator.
apply_permutation	Modifies operator's data by composing it with a permutation.
compose	Return the operator composition with another Operator.
conjugate	Return the conjugate of the Operator.
copy	Make a deep copy of current operator.
dot	Return the right multiplied operator self * other.
equiv	Return True if operators are equivalent up to global phase.
expand	Return the reverse-order tensor product with another Operator.
from_circuit	Create a new Operator object from a QuantumCircuit
from_label	Return a tensor product of single-qubit operators.
input_dims	Return tuple of input dimension for specified subsystems.
is_unitary	Return True if operator is a unitary matrix.
output_dims	Return tuple of output dimension for specified subsystems.
power	Return the matrix power of the operator.
reshape	Return a shallow copy with reshaped input and output subsystem dimensions.
reverse_qargs	Return an Operator with reversed subsystem ordering.
tensor	Return the tensor product with another Operator.
to_instruction	Convert to a UnitaryGate instruction.
to_matrix	Convert operator to NumPy matrix.
to_operator	Convert operator to matrix operator class
transpose	Return the transpose of the Operator.

Attributes

atol = 1e-08

data

Return data.

dim

Return tuple (input_shape, output_shape).

num_qubits

Return the number of qubits if a N-qubit operator or None otherwise.

qargs

Return the qargs for the operator.

rtol = 1e-05

settings

Return operator settings.