ConsolidateBlocks

class qiskit.transpiler.passes.ConsolidateBlocks(*args, **kwargs)[source]

Bases: TransformationPass

Replace each block of consecutive gates by a single Unitary node.

Pass to consolidate sequences of uninterrupted gates acting on the same qubits into a Unitary node, to be resynthesized later, to a potentially more optimal subcircuit.

Notes

This pass assumes that the ‘blocks_list’ property that it reads is given such that blocks are in topological order. The blocks are collected by a previous pass, such as Collect2qBlocks.

ConsolidateBlocks initializer.

If kak_basis_gate is not None it will be used as the basis gate for KAK decomposition. Otherwise, if basis_gates is not None a basis gate will be chosen from this list. Otherwise, the basis gate will be CXGate.

Parameters:

  • kak_basis_gate (Gate) – Basis gate for KAK decomposition.

  • force_consolidate (bool) – Force block consolidation.

  • basis_gates (List(str)) – Basis gates from which to choose a KAK gate.

  • approximation_degree (float) – a float between $[0.0, 1.0]$. Lower approximates more.

  • target (Target) – The target object for the compilation target backend.

Attributes

is_analysis_pass

Check if the pass is an analysis pass.

If the pass is an AnalysisPass, that means that the pass can analyze the DAG and write the results of that analysis in the property set. Modifications on the DAG are not allowed by this kind of pass.

is_transformation_pass

Check if the pass is a transformation pass.

If the pass is a TransformationPass, that means that the pass can manipulate the DAG, but cannot modify the property set (but it can be read).

Methods

execute(passmanager_ir, state, callback=None)

Execute optimization task for input Qiskit IR.

Parameters:

  • passmanager_ir (Any) – Qiskit IR to optimize.

  • state (PassManagerState) – State associated with workflow execution by the pass manager itself.

  • callback (Callable | None) – A callback function which is caller per execution of optimization task.

Returns:

Optimized Qiskit IR and state of the workflow.

Return type:

tuple[Any, qiskit.passmanager.compilation_status.PassManagerState]

name()

Name of the pass.

Return type:

str

run(dag)[source]

Run the ConsolidateBlocks pass on dag.

Iterate over each block and replace it with an equivalent Unitary on the same wires.

update_status(state, run_state)

Update workflow status.

Parameters:

  • state (PassManagerState) – Pass manager state to update.

  • run_state (RunState) – Completion status of current task.

Returns:

Updated pass manager state.

Return type:

PassManagerState