GateDirection

class qiskit.transpiler.passes.GateDirection(*args, **kwargs)

Bases: TransformationPass

Modify asymmetric gates to match the hardware coupling direction.

This pass makes use of the following identities:

                     ┌───┐┌───┐┌───┐
q_0: ──■──      q_0: ┤ H ├┤ X ├┤ H ├
     ┌─┴─┐  =        ├───┤└─┬─┘├───┤
q_1: ┤ X ├      q_1: ┤ H ├──■──┤ H ├
     └───┘           └───┘     └───┘
 
 
                  global phase: 3π/2
     ┌──────┐           ┌───┐ ┌────┐┌─────┐┌──────┐┌───┐
q_0: ┤0     ├     q_0: ─┤ S ├─┤ √X ├┤ Sdg ├┤1     ├┤ H ├
     │  ECR │  =       ┌┴───┴┐├────┤└┬───┬┘│  Ecr │├───┤
q_1: ┤1     ├     q_1: ┤ Sdg ├┤ √X ├─┤ S ├─┤0     ├┤ H ├
     └──────┘          └─────┘└────┘ └───┘ └──────┘└───┘
 
 
     ┌──────┐          ┌───┐┌──────┐┌───┐
q_0: ┤0     ├     q_0: ┤ H ├┤1     ├┤ H ├
     │  RZX │  =       ├───┤│  RZX │├───┤
q_1: ┤1     ├     q_1: ┤ H ├┤0     ├┤ H ├
     └──────┘          └───┘└──────┘└───┘

This pass assumes that the positions of the qubits in the DAGCircuit.qubits attribute are the physical qubit indices. For example if dag.qubits[0] is qubit 0 in the CouplingMap or Target.

GateDirection pass.

Parameters

coupling_map (CouplingMap) – Directed graph represented a coupling map.
target (Target) – The backend target to use for this pass. If this is specified it will be used instead of the coupling map

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

execute(passmanager_ir, state, callback=None)

GitHub

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.