ComposedOp¶
- class ComposedOp(oplist, coeff=1.0, abelian=False)[source]¶
Bases:
qiskit.opflow.list_ops.list_op.ListOp
A class for lazily representing compositions of Operators. Often Operators cannot be efficiently composed with one another, but may be manipulated further so that they can be composed later. This class holds logic to indicate that the Operators in
oplist
are meant to be composed, and therefore if they reach a point in which they can be, such as after conversion to QuantumCircuits or matrices, they can be reduced by composition.- Parameters
oplist (
List
[OperatorBase
]) – The Operators being composed.coeff (
Union
[complex
,ParameterExpression
]) – A coefficient multiplying the operatorabelian (
bool
) – Indicates whether the Operators inoplist
are known to mutually commute.
Methods Defined Here
Return a new Operator equal to the Operator's adjoint (conjugate transpose), overloaded by
~
.Return Operator Composition between self and other (linear algebra-style: A@B(x) = A(B(x))), overloaded by
@
.Evaluate the Operator's underlying function, either on a binary string or another Operator.
Reduce without attempting to expand all distributive compositions.
Try collapsing the Operator structure, usually after some type of conversion, e.g.
Returns the quantum circuit, representing the composed operator.
Return NumPy representation of the Operator.
Attributes
- INDENTATION = ' '¶
- abelian¶
Whether the Operators in
oplist
are known to commute with one another.- Return type
bool
- Returns
A bool indicating whether the
oplist
is Abelian.
- coeff¶
The scalar coefficient multiplying the Operator.
- Return type
Union
[complex
,ParameterExpression
]- Returns
The coefficient.
- coeffs¶
Return a list of the coefficients of the operators listed. Raises exception for nested Listops.
- Return type
List
[Union
[complex
,ParameterExpression
]]
- combo_fn¶
The function defining how to combine
oplist
(or Numbers, or NumPy arrays) to produce the Operator’s underlying function. For example, SummedOp’s combination function is to add all of the Operators inoplist
.- Return type
Callable
- Returns
The combination function.
- distributive¶
- Return type
bool
- grad_combo_fn¶
The gradient of
combo_fn
.- Return type
Optional
[Callable
]
- instance_id¶
Return the unique instance id.
- Return type
int
- num_qubits¶
- Return type
int
- oplist¶
The list of
OperatorBases
defining the underlying function of this Operator.- Return type
List
[OperatorBase
]- Returns
The Operators defining the ListOp
- parameters¶
- settings¶
Return settings.
- Return type
Dict