qiskit.opflow.OperatorBase¶

class
OperatorBase
[소스]¶ A base class for all Operators: PrimitiveOps, StateFns, ListOps, etc. Operators are defined as functions which take one complex binary function to another. These complex binary functions are represented by StateFns, which are themselves a special class of Operators taking only the
Zero
StateFn to the complex binary function they represent.Operators can be used to construct complicated functions and computation, and serve as the building blocks for algorithms.
Methods
__init__
()Initialize self.
add
(other)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
(param_dict)Binds scalar values to any Terra
Parameters
in the coefficients or primitives of the Operator, or substitutes oneParameter
for another.bind_parameters
(param_dict)Same as assign_parameters, but maintained for consistency with QuantumCircuit in Terra (which has both assign_parameters and bind_parameters).
compose
(other[, permutation, front])Return Operator Composition between self and other (linear algebrastyle: A@B(x) = A(B(x))), overloaded by
@
.copy
()Return a deep copy of the Operator.
equals
(other)Evaluate Equality between Operators, overloaded by
==
.eval
([front])Evaluate the Operator’s underlying function, either on a binary string or another Operator.
mul
(scalar)Returns the scalar multiplication of the Operator, overloaded by
*
, including support for Terra’sParameters
, which can be bound to values later (viabind_parameters
).neg
()Return the Operator’s negation, effectively just multiplying by 1.0, overloaded by

.permute
(permutation)Permutes the qubits of the operator.
power
(exponent)Return Operator composed with self multiple times, overloaded by
**
.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.
tensor
(other)Return tensor product between self and other, overloaded by
^
.tensorpower
(other)Return tensor product with self multiple times, overloaded by
^
.Returns a
CircuitOp
equivalent to this Operator.to_matrix
([massive])Return NumPy representation of the Operator.
to_matrix_op
([massive])Returns a
MatrixOp
equivalent to this Operator.Return SciPy sparse matrix representation of the Operator.
Attributes
INDENTATION
Return the unique instance id.
The number of qubits over which the Operator is defined.
Return a set of Parameter objects contained in the Operator.
Return settings of this object in a dictionary.

abstract
add
(other)[소스]¶ Return Operator addition of self and other, overloaded by
+
. 매개변수
other (
OperatorBase
) – AnOperatorBase
with the same number of qubits as self, and in the same ‘Operator’, ‘State function’, or ‘Measurement’ category as self (i.e. the same type of underlying function). 반환 형식
OperatorBase
 반환값
An
OperatorBase
equivalent to the sum of self and other.

abstract
adjoint
()[소스]¶ Return a new Operator equal to the Operator’s adjoint (conjugate transpose), overloaded by
~
. For StateFns, this also turns the StateFn into a measurement. 반환 형식
OperatorBase
 반환값
An
OperatorBase
equivalent to the adjoint of self.

abstract
assign_parameters
(param_dict)[소스]¶ Binds scalar values to any Terra
Parameters
in the coefficients or primitives of the Operator, or substitutes oneParameter
for another. This method differs from Terra’sassign_parameters
in that it also supports lists of values to assign for a giveParameter
, in which case self will be copied for each parameterization in the binding list(s), and all the copies will be returned in anOpList
. If lists of parameterizations are used, everyParameter
in the param_dict must have the same length list of parameterizations. 매개변수
param_dict (
Dict
[ParameterExpression
,Union
[complex
,ParameterExpression
,List
[Union
[complex
,ParameterExpression
]]]]) – The dictionary ofParameters
to replace, and values or lists of values by which to replace them. 반환 형식
OperatorBase
 반환값
The
OperatorBase
with theParameters
in self replaced by the values orParameters
in param_dict. If param_dict contains parameterization lists, thisOperatorBase
is anOpList
.

bind_parameters
(param_dict)[소스]¶ Same as assign_parameters, but maintained for consistency with QuantumCircuit in Terra (which has both assign_parameters and bind_parameters).
 반환 형식
OperatorBase

abstract
compose
(other, permutation=None, front=False)[소스]¶ Return Operator Composition between self and other (linear algebrastyle: A@B(x) = A(B(x))), overloaded by
@
.Note: You must be conscious of Quantum Circuit vs. Linear Algebra ordering conventions. Meaning, X.compose(Y) produces an X∘Y on qubit 0, but would produce a QuantumCircuit which looks like
[Y][X]
Because Terra prints circuits with the initial state at the left side of the circuit.
 매개변수
other (
OperatorBase
) – TheOperatorBase
with which to compose self.permutation (
Optional
[List
[int
]]) –List[int]
which defines permutation on other operator.front (
bool
) – If front==True, returnother.compose(self)
.
 반환 형식
OperatorBase
 반환값
An
OperatorBase
equivalent to the function composition of self and other.

abstract
equals
(other)[소스]¶ Evaluate Equality between Operators, overloaded by
==
. Only returns True if self and other are of the same representation (e.g. a DictStateFn and CircuitStateFn will never be equal, even if their vector representations are equal), their underlying primitives are equal (this means for ListOps, OperatorStateFns, or EvolvedOps the equality is evaluated recursively downwards), and their coefficients are equal. 매개변수
other (
OperatorBase
) – TheOperatorBase
to compare to self. 반환 형식
bool
 반환값
A bool equal to the equality of self and other.

abstract
eval
(front=None)[소스]¶ Evaluate the Operator’s underlying function, either on a binary string or another Operator. A square binary Operator can be defined as a function taking a binary function to another binary function. This method returns the value of that function for a given StateFn or binary string. For example,
op.eval('0110').eval('1110')
can be seen as querying the Operator’s matrix representation by row 6 and column 14, and will return the complex value at those “indices.” Similarly for a StateFn,op.eval('1011')
will return the complex value at row 11 of the vector representation of the StateFn, as all StateFns are defined to be evaluated from Zero implicitly (i.e. it is as if.eval('0000')
is already called implicitly to always “indexing” from column 0).If
front
is None, the matrixrepresentation of the operator is returned. 매개변수
front (
Union
[str
,Dict
[str
,complex
],ndarray
,OperatorBase
,Statevector
,None
]) – The bitstring, dict of bitstrings (with values being coefficients), or StateFn to evaluated by the Operator’s underlying function, or None. 반환 형식
Union
[OperatorBase
,complex
] 반환값
The output of the Operator’s evaluation function. If self is a
StateFn
, the result is a float or complex. If self is an Operator (PrimitiveOp, ComposedOp, SummedOp, EvolvedOp,
etc.), the result is a StateFn. Iffront
is None, the matrixrepresentation of the operator is returned, which is aMatrixOp
for the operators and aVectorStateFn
for statefunctions. If either self or front contain properListOps
(not ListOp subclasses), the result is an ndimensional list of complex or StateFn results, resulting from the recursive evaluation by each OperatorBase in the ListOps.

property
instance_id
¶ Return the unique instance id.
 반환 형식
int

abstract
mul
(scalar)[소스]¶ Returns the scalar multiplication of the Operator, overloaded by
*
, including support for Terra’sParameters
, which can be bound to values later (viabind_parameters
). 매개변수
scalar (
Union
[complex
,ParameterExpression
]) – The real or complex scalar by which to multiply the Operator, or theParameterExpression
to serve as a placeholder for a scalar factor. 반환 형식
OperatorBase
 반환값
An
OperatorBase
equivalent to product of self and scalar.

neg
()[소스]¶ Return the Operator’s negation, effectively just multiplying by 1.0, overloaded by

. 반환 형식
OperatorBase
 반환값
An
OperatorBase
equivalent to the negation of self.

abstract property
num_qubits
¶ The number of qubits over which the Operator is defined. If
op.num_qubits == 5
, thenop.eval('1' * 5)
will be valid, butop.eval('11')
will not. 반환 형식
int
 반환값
The number of qubits accepted by the Operator’s underlying function.

abstract property
parameters
¶ Return a set of Parameter objects contained in the Operator.

abstract
permute
(permutation)[소스]¶ Permutes the qubits of the operator.
 매개변수
permutation (
List
[int
]) – A list defining where each qubit should be permuted. The qubit at index j should be permuted to position permutation[j]. 반환 형식
OperatorBase
 반환값
A new OperatorBase containing the permuted operator.
 예외
OpflowError – if indices do not define a new index for each qubit.

power
(exponent)¶ Return Operator composed with self multiple times, overloaded by
**
.

abstract
primitive_strings
()[소스]¶ Return a set of strings describing the primitives contained in the Operator. For example,
{'QuantumCircuit', 'Pauli'}
. For hierarchical Operators, such asListOps
, this can help illuminate the primitives represented in the various recursive levels, and therefore which conversions can be applied. 반환 형식
Set
[str
] 반환값
A set of strings describing the primitives contained within the Operator.

abstract
reduce
()[소스]¶ Try collapsing the Operator structure, usually after some type of conversion, e.g. trying to add Operators in a SummedOp or delete needless IGates in a CircuitOp. If no reduction is available, just returns self.
 반환값
The reduced
OperatorBase
.

abstract property
settings
¶ Return settings of this object in a dictionary.
You can, for example, use this
settings
dictionary to serialize the object in JSON format, if the JSON encoder you use supports all types in the dictionary. 반환 형식
Dict
 반환값
Object settings in a dictionary.

abstract
tensor
(other)[소스]¶ Return tensor product between self and other, overloaded by
^
. Note: You must be conscious of Qiskit’s bigendian bit printing convention. Meaning, X.tensor(Y) produces an X on qubit 0 and an Y on qubit 1, or X⨂Y, but would produce a QuantumCircuit which looks like[Y] [X]
Because Terra prints circuits and results with qubit 0 at the end of the string or circuit.
 매개변수
other (
OperatorBase
) – TheOperatorBase
to tensor product with self. 반환 형식
OperatorBase
 반환값
An
OperatorBase
equivalent to the tensor product of self and other.

abstract
tensorpower
(other)[소스]¶ Return tensor product with self multiple times, overloaded by
^
. 매개변수
other (
int
) – The int number of times to tensor product self with itself viatensorpower
. 반환 형식
Union
[OperatorBase
,int
] 반환값
An
OperatorBase
equivalent to the tensorpower of self by other.

abstract
to_matrix
(massive=False)[소스]¶ Return NumPy representation of the Operator. Represents the evaluation of the Operator’s underlying function on every combination of basis binary strings. Warn if more than 16 qubits to force having to set
massive=True
if such a large vector is desired. 반환 형식
ndarray
 반환값
The NumPy
ndarray
equivalent to this Operator.

abstract