qiskit.transpiler.passes.CXDirection
class CXDirection(*args, **kwargs)
Rearrange the direction of the cx nodes to match the directed coupling map.
Flip the cx nodes to match the directed coupling map. This pass makes use of the following equivalence:
---(+)--- --[H]---.---[H]--
| = |
----.---- --[H]--(+)--[H]--CXDirection initializer.
Parameters
coupling_map (CouplingMap) – Directed graph represented a coupling map.
__init__
__init__(coupling_map)
CXDirection initializer.
Parameters
coupling_map (CouplingMap) – Directed graph represented a coupling map.
Methods
__init__(coupling_map) | CXDirection initializer. |
name() | Return the name of the pass. |
run(dag) | Run the CXDirection pass on dag. |
Attributes
is_analysis_pass | Check if the pass is an analysis pass. |
is_transformation_pass | Check if the pass is a transformation pass. |
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).
name
name()
Return the name of the pass.
run
run(dag)
Run the CXDirection pass on dag.
Flips the cx nodes to match the directed coupling map. Modifies the input dag.
Parameters
dag (DAGCircuit) – DAG to map.
Returns
The rearranged dag for the coupling map
Return type
Raises
TranspilerError – If the circuit cannot be mapped just by flipping the cx nodes.