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# PauliOp¶

class PauliOp(primitive, coeff=1.0)[source]

Bases: `PrimitiveOp`

Class for Operators backed by Terra's `Pauli` module.

Parameters
Raises

TypeError -- invalid parameters.

Methods Defined Here

 `add` Return Operator addition of self and other, overloaded by `+`. `adjoint` Return a new Operator equal to the Operator's adjoint (conjugate transpose), overloaded by `~`. `compose` Return Operator Composition between self and other (linear algebra-style: A@B(x) = A(B(x))), overloaded by `@`. `equals` Evaluate Equality between Operators, overloaded by `==`. `eval` Evaluate the Operator's underlying function, either on a binary string or another Operator. `exp_i` Return a `CircuitOp` equivalent to e^-iH for this operator H. `permute` Permutes the sequence of Pauli matrices. `primitive_strings` Return a set of strings describing the primitives contained in the Operator. `tensor` Return tensor product between self and other, overloaded by `^`. `to_circuit` Returns a `QuantumCircuit` equivalent to this Operator. `to_instruction` Returns an `Instruction` equivalent to this Operator. `to_matrix` Return NumPy representation of the Operator. `to_pauli_op` Returns a sum of `PauliOp` s equivalent to this Operator. `to_spmatrix` Returns SciPy sparse matrix representation of the Operator.

Attributes

INDENTATION = '  '
coeff

The scalar coefficient multiplying the Operator.

Return type

`Union`[`complex`, `ParameterExpression`]

Returns

The coefficient.

instance_id

Return the unique instance id.

Return type

`int`

num_qubits
Return type

`int`

parameters
primitive: Pauli

The primitive defining the underlying function of the Operator.

Return type
Returns

The primitive object.

settings

Return operator settings.

Return type

`Dict`