OperatorStateFn¶

class
OperatorStateFn
(primitive, coeff=1.0, is_measurement=False)[Quellcode]¶ Bases:
qiskit.opflow.state_fns.state_fn.StateFn
A class for state functions and measurements which are defined by a density Operator, stored using an
OperatorBase
. Parameter
primitive (
OperatorBase
) – TheOperatorBase
which defines the behavior of the underlying State function.coeff (
Union
[complex
,ParameterExpression
]) – A coefficient by which to multiply the state functionis_measurement (
bool
) – Whether the StateFn is a measurement operator
Methods Defined Here
Return Operator addition of self and other, overloaded by
+
.Return a new Operator equal to the Operator’s adjoint (conjugate transpose), overloaded by
~
.Evaluate the Operator’s underlying function, either on a binary string or another Operator.
Permute the qubits of the state function.
Return a set of strings describing the primitives contained in the Operator.
Sample the state function as a normalized probability distribution.
Return tensor product between self and other, overloaded by
^
.Return
StateFnCircuit
corresponding to this StateFn.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.
Note: this does not return a density matrix, it returns a classical matrix containing the quantum or classical vector representing the evaluation of the state function on each binary basis state.
Return a MatrixOp for this operator.
Attributes

INDENTATION
= ' '¶

coeff
¶ A coefficient by which the state function is multiplied.
 Rückgabetyp
Union
[complex
,ParameterExpression
]

instance_id
¶ Return the unique instance id.
 Rückgabetyp
int

is_measurement
¶ Whether the StateFn object is a measurement Operator.
 Rückgabetyp
bool

num_qubits
¶  Rückgabetyp
int

parameters
¶

primitive
: qiskit.opflow.operator_base.OperatorBase¶ The primitive which defines the behavior of the underlying State function.

settings
¶ Return settings.
 Rückgabetyp
Dict