qiskit.aqua.operators.primitive_ops.PrimitiveOp¶

class
PrimitiveOp
(primitive=None, coeff=1.0)[código fonte]¶ A class for representing basic Operators, backed by Operator primitives from Terra. This class (and inheritors) primarily serves to allow the underlying primitives to “flow”  i.e. interoperability and adherence to the Operator formalism  while the core computational logic mostly remains in the underlying primitives. For example, we would not produce an interface in Terra in which
QuantumCircuit1 + QuantumCircuit2
equaled the Operator sum of the circuit unitaries, rather than simply appending the circuits. However, within the Operator flow summing the unitaries is the expected behavior.Note that all mathematical methods are not inplace, meaning that they return a new object, but the underlying primitives are not copied.
 Parâmetros
primitive (
Union
[Instruction
,QuantumCircuit
,List
,ndarray
,spmatrix
,Operator
,Pauli
,None
]) – The operator primitive being wrapped.coeff (
Union
[int
,float
,complex
,ParameterExpression
]) – A coefficient multiplying the primitive.

__init__
(primitive=None, coeff=1.0)[código fonte]¶  Parâmetros
primitive (
Union
[Instruction
,QuantumCircuit
,List
,ndarray
,spmatrix
,Operator
,Pauli
,None
]) – The operator primitive being wrapped.coeff (
Union
[int
,float
,complex
,ParameterExpression
]) – A coefficient multiplying the primitive.
Methods
__init__
([primitive, coeff]) type primitive
Union
[Instruction
,QuantumCircuit
,List
,ndarray
,spmatrix
,Operator
,Pauli
,None
]
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
@
.equals
(other)Evaluate Equality between Operators, overloaded by
==
.eval
([front])Evaluate the Operator’s underlying function, either on a binary string or another Operator.
exp_i
()Return Operator exponentiation, equaling e^(i * op)
log_i
([massive])Return a
MatrixOp
equivalent to log(H)/i for this operator H.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
QuantumCircuit
equivalent to this Operator.Returns a
CircuitOp
equivalent to this Operator.Returns an
Instruction
equivalent to this Operator.to_legacy_op
([massive])Attempt to return the Legacy Operator representation of the Operator.
to_matrix
([massive])Return NumPy representation of the Operator.
to_matrix_op
([massive])Returns a
MatrixOp
equivalent to this Operator.to_pauli_op
([massive])Returns a sum of
PauliOp
s equivalent to this Operator.Attributes
ENABLE_DEPRECATION
INDENTATION
The scalar coefficient multiplying the Operator.
The number of qubits over which the Operator is defined.
Return a set of Parameter objects contained in the Operator.
The primitive defining the underlying function of the Operator.

add
(other)[código fonte]¶ Return Operator addition of self and other, overloaded by
+
. Parâmetros
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). Tipo de retorno
OperatorBase
 Retorna
An
OperatorBase
equivalent to the sum of self and other.

adjoint
()[código fonte]¶ Return a new Operator equal to the Operator’s adjoint (conjugate transpose), overloaded by
~
. For StateFns, this also turns the StateFn into a measurement. Tipo de retorno
OperatorBase
 Retorna
An
OperatorBase
equivalent to the adjoint of self.

assign_parameters
(param_dict)[código fonte]¶ 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. Parâmetros
param_dict (
dict
) – The dictionary ofParameters
to replace, and values or lists of values by which to replace them. Tipo de retorno
OperatorBase
 Retorna
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)¶ Same as assign_parameters, but maintained for consistency with QuantumCircuit in Terra (which has both assign_parameters and bind_parameters).
 Tipo de retorno
OperatorBase

property
coeff
¶ The scalar coefficient multiplying the Operator.
 Tipo de retorno
Union
[int
,float
,complex
,ParameterExpression
] Retorna
The coefficient.

compose
(other, permutation=None, front=False)[código fonte]¶ 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.
 Parâmetros
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)
.
 Tipo de retorno
OperatorBase
 Retorna
An
OperatorBase
equivalent to the function composition of self and other.

equals
(other)[código fonte]¶ 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. Parâmetros
other (
OperatorBase
) – TheOperatorBase
to compare to self. Tipo de retorno
bool
 Retorna
A bool equal to the equality of self and other.

eval
(front=None)[código fonte]¶ 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. Parâmetros
front (
Union
[str
,Dict
[str
,complex
],ndarray
,OperatorBase
,None
]) – The bitstring, dict of bitstrings (with values being coefficients), or StateFn to evaluated by the Operator’s underlying function, or None. Tipo de retorno
Union
[OperatorBase
,float
,complex
] Retorna
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.

exp_i
()[código fonte]¶ Return Operator exponentiation, equaling e^(i * op)
 Tipo de retorno
OperatorBase

log_i
(massive=False)[código fonte]¶ Return a
MatrixOp
equivalent to log(H)/i for this operator H. This function is the effective inverse of exp_i, equivalent to finding the Hermitian Operator which produces self when exponentiated. Tipo de retorno
OperatorBase

mul
(scalar)[código fonte]¶ Returns the scalar multiplication of the Operator, overloaded by
*
, including support for Terra’sParameters
, which can be bound to values later (viabind_parameters
). Parâmetros
scalar (
Union
[int
,float
,complex
,ParameterExpression
]) – The real or complex scalar by which to multiply the Operator, or theParameterExpression
to serve as a placeholder for a scalar factor. Tipo de retorno
OperatorBase
 Retorna
An
OperatorBase
equivalent to product of self and scalar.

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

. Tipo de retorno
OperatorBase
 Retorna
An
OperatorBase
equivalent to the negation of self.

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. Tipo de retorno
int
 Retorna
The number of qubits accepted by the Operator’s underlying function.

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

permute
(permutation)[código fonte]¶ Permutes the qubits of the operator.
 Parâmetros
permutation (
List
[int
]) – A list defining where each qubit should be permuted. The qubit at index j should be permuted to position permutation[j]. Tipo de retorno
OperatorBase
 Retorna
A new OperatorBase containing the permuted operator.
 Levanta
AquaError – if indices do not define a new index for each qubit.

power
(exponent)[código fonte]¶ Return Operator composed with self multiple times, overloaded by
**
. Parâmetros
exponent (
int
) – The int number of times to compose self with itself. Tipo de retorno
OperatorBase
 Retorna
An
OperatorBase
equivalent to self composed with itself exponent times.

property
primitive
¶ The primitive defining the underlying function of the Operator.
 Tipo de retorno
Union
[Instruction
,QuantumCircuit
,List
,ndarray
,spmatrix
,Operator
,Pauli
] Retorna
The primitive object.

primitive_strings
()[código fonte]¶ 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. Tipo de retorno
Set
[str
] Retorna
A set of strings describing the primitives contained within the Operator.

reduce
()[código fonte]¶ 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.
 Tipo de retorno
OperatorBase
 Retorna
The reduced
OperatorBase
.

tensor
(other)[código fonte]¶ 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.
 Parâmetros
other (
OperatorBase
) – TheOperatorBase
to tensor product with self. Tipo de retorno
OperatorBase
 Retorna
An
OperatorBase
equivalent to the tensor product of self and other.

tensorpower
(other)[código fonte]¶ Return tensor product with self multiple times, overloaded by
^
. Parâmetros
other (
int
) – The int number of times to tensor product self with itself viatensorpower
. Tipo de retorno
Union
[OperatorBase
,int
] Retorna
An
OperatorBase
equivalent to the tensorpower of self by other.

to_circuit
()[código fonte]¶ Returns a
QuantumCircuit
equivalent to this Operator. Tipo de retorno
QuantumCircuit

to_circuit_op
()[código fonte]¶ Returns a
CircuitOp
equivalent to this Operator. Tipo de retorno
OperatorBase

to_instruction
()[código fonte]¶ Returns an
Instruction
equivalent to this Operator. Tipo de retorno
Instruction

to_legacy_op
(massive=False)[código fonte]¶ Attempt to return the Legacy Operator representation of the Operator. If self is a
SummedOp
ofPauliOps
, will attempt to convert toWeightedPauliOperator
, and otherwise will simply convert toMatrixOp
and then toMatrixOperator
. The Legacy Operators cannot representStateFns
or properListOps
(meaning not one of theListOp
subclasses), so an error will be thrown if this method is called on such an Operator. Also, Legacy Operators cannot represent unbound Parameter coeffs, so an error will be thrown if any are present in self.Warn if more than 16 qubits to force having to set
massive=True
if such a large vector is desired. Tipo de retorno
LegacyBaseOperator
 Retorna
The
LegacyBaseOperator
representing this Operator. Levanta
TypeError – self is an Operator which cannot be represented by a
LegacyBaseOperator
, such asStateFn
, proper (nonsubclass)ListOp
, or an Operator with an unbound coeff Parameter.

to_matrix
(massive=False)[código fonte]¶ 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. Tipo de retorno
ndarray
 Retorna
The NumPy
ndarray
equivalent to this Operator.

to_matrix_op
(massive=False)[código fonte]¶ Returns a
MatrixOp
equivalent to this Operator. Tipo de retorno
OperatorBase

to_pauli_op
(massive=False)[código fonte]¶ Returns a sum of
PauliOp
s equivalent to this Operator. Tipo de retorno
OperatorBase