qml.estimator.ops.SWAP¶
- class SWAP(wires=None)[source]
Bases:
ResourceOperatorResource class for the SWAP gate.
- Parameters:
wires (Sequence[int] | None) – the wires the operation acts on
- Resources:
The resources come from the following identity expressing SWAP as the product of three
CNOTgates:\[\begin{split}SWAP = \begin{bmatrix} 1 & 0 & 0 & 0 \\ 0 & 0 & 1 & 0\\ 0 & 1 & 0 & 0\\ 0 & 0 & 0 & 1 \end{bmatrix} = \begin{bmatrix} 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0\\ 0 & 0 & 0 & 1\\ 0 & 0 & 1 & 0 \end{bmatrix} \begin{bmatrix} 1 & 0 & 0 & 0 \\ 0 & 0 & 0 & 1\\ 0 & 0 & 1 & 0\\ 0 & 1 & 0 & 0 \end{bmatrix} \begin{bmatrix} 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0\\ 0 & 0 & 0 & 1\\ 0 & 0 & 1 & 0 \end{bmatrix}.\end{split}\]
See also
The corresponding PennyLane operation
SWAP.Example
The resources for this operation are computed using:
>>> qml.estimator.SWAP.resource_decomp() [(3 x CNOT)]
Attributes
Returns a dictionary containing the minimal information needed to compute the resources.
- num_wires = 2¶
- resource_params¶
Returns a dictionary containing the minimal information needed to compute the resources.
- Returns:
Empty dictionary. The resources of this operation don’t depend on any additional parameters.
- Return type:
dict
Methods
adjoint_resource_decomp([target_resource_params])Returns a list representing the resources for the adjoint of the operator.
controlled_resource_decomp(num_ctrl_wires, ...)Returns a list representing the resources for a controlled version of the operator.
pow_resource_decomp(pow_z[, ...])Returns a list representing the resources for an operator raised to a power.
Returns a list representing the resources of the operator.
Returns a compressed representation containing only the parameters of the operator that are needed to compute a resource estimation.
- classmethod adjoint_resource_decomp(target_resource_params=None)[source]¶
Returns a list representing the resources for the adjoint of the operator.
- Parameters:
target_resource_params (dict | None) – A dictionary containing the resource parameters of the target operator.
- Resources:
This operation is self-adjoint, so the resources of the adjoint operation are same as the original operation.
- Returns:
A list of
GateCountobjects, where each object represents a specific quantum gate and the number of times it appears in the decomposition.- Return type:
list[
GateCount]
- classmethod controlled_resource_decomp(num_ctrl_wires, num_zero_ctrl, target_resource_params=None)[source]¶
Returns a list representing the resources for a controlled version of the operator.
- Parameters:
num_ctrl_wires (int) – the number of qubits the operation is controlled on
num_zero_ctrl (int) – the number of control qubits, that are controlled when in the \(|0\rangle\) state
target_resource_params (dict | None) – A dictionary containing the resource parameters of the target operator.
- Resources:
For a single control wire, the cost is a single instance of
CSWAP. Two additionalXgates are used to flip the control qubit if it is zero-controlled.In the case where multiple controlled wires are provided, the resources are given by two
CNOTgates and oneMultiControlledXgate. This is because of the symmetric resource decomposition of the SWAP gate. By controlling on the middle CNOT gate, we obtain the required controlled operation.
- Returns:
A list of
GateCountobjects, where each object represents a specific quantum gate and the number of times it appears in the decomposition.- Return type:
list[
GateCount]
- classmethod pow_resource_decomp(pow_z, target_resource_params=None)[source]¶
Returns a list representing the resources for an operator raised to a power.
- Parameters:
pow_z (int) – the power that the operator is being raised to
target_resource_params (dict | None) – A dictionary containing the resource parameters of the target operator.
- Resources:
The
SWAPgate raised to even powers produces identity and raised to odd powers it produces itself.
- Returns:
A list of
GateCountobjects, where each object represents a specific quantum gate and the number of times it appears in the decomposition.- Return type:
list[
GateCount]
- classmethod resource_decomp()[source]¶
Returns a list representing the resources of the operator. Each object represents a quantum gate and the number of times it occurs in the decomposition.
- Resources:
The resources come from the following identity expressing SWAP as the product of three
CNOTgates:\[\begin{split}SWAP = \begin{bmatrix} 1 & 0 & 0 & 0 \\ 0 & 0 & 1 & 0\\ 0 & 1 & 0 & 0\\ 0 & 0 & 0 & 1 \end{bmatrix} = \begin{bmatrix} 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0\\ 0 & 0 & 0 & 1\\ 0 & 0 & 1 & 0 \end{bmatrix} \begin{bmatrix} 1 & 0 & 0 & 0 \\ 0 & 0 & 0 & 1\\ 0 & 0 & 1 & 0\\ 0 & 1 & 0 & 0 \end{bmatrix} \begin{bmatrix} 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0\\ 0 & 0 & 0 & 1\\ 0 & 0 & 1 & 0 \end{bmatrix}.\end{split}\]