qml.labs.resource_estimation.ResourcePhaseShift¶
- class ResourcePhaseShift(precision=None, wires=None)[source]¶
Bases:
ResourceOperatorResource class for the PhaseShift gate.
- Keyword Arguments:
precision (float, optional) – The error threshold for clifford plus T decomposition of this operation. The default value is None which corresponds to using the precision stated in the config.
wires (Any or Wires, optional) – the wire the operation acts on
- Resources:
The phase shift gate is equivalent to a Z-rotation upto some global phase, as defined from the following identity:
\[\begin{split}R_\phi(\phi) = e^{i\phi/2}R_z(\phi) = \begin{bmatrix} 1 & 0 \\ 0 & e^{i\phi} \end{bmatrix}.\end{split}\]
See also
Example
The resources for this operation are computed as:
>>> plre.ResourcePhaseShift.resource_decomp() [(1 x RZ), (1 x GlobalPhase)]
Attributes
Returns a dictionary containing the minimal information needed to compute the resources.
- num_wires = 1¶
- resource_keys = {'precision'}¶
- resource_params¶
Returns a dictionary containing the minimal information needed to compute the resources.
- Returns:
precision (Union[float, None]): error threshold for the approximation
- Return type:
A dictionary containing the resource parameters
Methods
adjoint_resource_decomp([precision])Returns a list representing the resources for the adjoint of the operator.
controlled_resource_decomp(...[, precision])Returns a list representing the resources for a controlled version of the operator.
dequeue(op_to_remove[, context])Remove the given resource operator(s) from the Operator queue.
pow_resource_decomp(pow_z[, precision])Returns a list representing the resources for an operator raised to a power.
queue([context])Append the operator to the Operator queue.
resource_decomp([precision])Returns a list representing the resources of the operator.
resource_rep([precision])Returns a compressed representation containing only the parameters of the Operator that are needed to compute the resources.
Returns a compressed representation directly from the operator
tracking_name(*args, **kwargs)Returns a name used to track the operator during resource estimation.
Returns the tracking name built with the operator's parameters.
- classmethod adjoint_resource_decomp(precision=None, **kwargs)[source]¶
Returns a list representing the resources for the adjoint of the operator.
- Resources:
The adjoint of a phase shift operator just changes the sign of the phase, thus the resources of the adjoint operation results in the original operation.
- Returns:
A list of GateCount objects, 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(ctrl_num_ctrl_wires, ctrl_num_ctrl_values, precision=None, **kwargs)[source]¶
Returns a list representing the resources for a controlled version of the operator.
- Parameters:
ctrl_num_ctrl_wires (int) – the number of qubits the operation is controlled on
ctrl_num_ctrl_values (int) – the number of control qubits, that are controlled when in the \(|0\rangle\) state
precision (float) – error threshold for clifford plus T decomposition of this operation
- Resources:
For a single control wire, the cost is a single instance of
ResourceControlledPhaseShift. Two additionalResourceXgates are used to flip the control qubit if it is zero-controlled.In the case where multiple controlled wires are provided, we can collapse the control wires by introducing one ‘clean’ auxilliary qubit (which gets reset at the end). In this case the cost increases by two additional
ResourceMultiControlledXgates, as described in (lemma 7.11) Elementary gates for quantum computation.
- Returns:
A list of GateCount objects, where each object represents a specific quantum gate and the number of times it appears in the decomposition.
- Return type:
list[GateCount]
- static dequeue(op_to_remove, context=<class 'pennylane.queuing.QueuingManager'>)¶
Remove the given resource operator(s) from the Operator queue.
- classmethod pow_resource_decomp(pow_z, precision=None, **kwargs)[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
- Resources:
Taking arbitrary powers of a phase shift produces a sum of shifts. The resources simplify to just one total phase shift operator.
- Returns:
A list of GateCount objects, where each object represents a specific quantum gate and the number of times it appears in the decomposition.
- Return type:
list[GateCount]
- queue(context=<class 'pennylane.queuing.QueuingManager'>)¶
Append the operator to the Operator queue.
- classmethod resource_decomp(precision=None, **kwargs)[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.
- Keyword Arguments:
precision (float) – error threshold for clifford plus T decomposition of this operation
- Resources:
The phase shift gate is equivalent to a Z-rotation upto some global phase, as defined from the following identity:
\[\begin{split}R_\phi(\phi) = e^{i\phi/2}R_z(\phi) = \begin{bmatrix} 1 & 0 \\ 0 & e^{i\phi} \end{bmatrix}.\end{split}\]
- Returns:
A list of GateCount objects, where each object represents a specific quantum gate and the number of times it appears in the decomposition.
- Return type:
list[GateCount]
- classmethod resource_rep(precision=None)[source]¶
Returns a compressed representation containing only the parameters of the Operator that are needed to compute the resources.
- resource_rep_from_op()¶
Returns a compressed representation directly from the operator
- classmethod tracking_name(*args, **kwargs)¶
Returns a name used to track the operator during resource estimation.
- tracking_name_from_op()¶
Returns the tracking name built with the operator’s parameters.