Transpiler Passes
qiskit.transpiler.passes
Layout Selection (Placement)
SetLayout(*args, **kwargs) | Set the layout property to the given layout. |
TrivialLayout(*args, **kwargs) | Choose a Layout by assigning n circuit qubits to device qubits 0, .., n-1. |
DenseLayout(*args, **kwargs) | Choose a Layout by finding the most connected subset of qubits. |
NoiseAdaptiveLayout(*args, **kwargs) | Choose a noise-adaptive Layout based on current calibration data for the backend. |
CSPLayout(*args, **kwargs) | If possible, chooses a Layout as a CSP, using backtracking. |
ApplyLayout(*args, **kwargs) | Transform a circuit with virtual qubits into a circuit with physical qubits. |
Layout2qDistance(*args, **kwargs) | Evaluate how good the layout selection was. |
EnlargeWithAncilla(*args, **kwargs) | Extend the dag with virtual qubits that are in layout but not in the circuit yet. |
FullAncillaAllocation(*args, **kwargs) | Allocate all idle nodes from the coupling map as ancilla on the layout. |
Routing
BasicSwap(*args, **kwargs) | Map (with minimum effort) a DAGCircuit onto a coupling_map adding swap gates. |
LookaheadSwap(*args, **kwargs) | Map input circuit onto a backend topology via insertion of SWAPs. |
StochasticSwap(*args, **kwargs) | Map a DAGCircuit onto a coupling_map adding swap gates. |
Basis Change
Unroller(*args, **kwargs) | Unroll a circuit to a given basis. |
Unroll3qOrMore(*args, **kwargs) | Recursively expands 3q+ gates until the circuit only contains 2q or 1q gates. |
Decompose([gate]) | Expand a gate in a circuit using its decomposition rules. |
Optimizations
Optimize1qGates(*args, **kwargs) | Optimize chains of single-qubit u1, u2, u3 gates by combining them into a single gate. |
Collect2qBlocks(*args, **kwargs) | Collect sequences of uninterrupted gates acting on 2 qubits. |
ConsolidateBlocks(*args, **kwargs) | Replace each block of consecutive gates by a single Unitary node. |
CXCancellation(*args, **kwargs) | Cancel back-to-back cx gates in dag. |
CommutationAnalysis(*args, **kwargs) | Analysis pass to find commutation relations between DAG nodes. |
CommutativeCancellation(*args, **kwargs) | Cancel the redundant (self-adjoint) gates through commutation relations. |
RemoveDiagonalGatesBeforeMeasure(*args, **kwargs) | Remove diagonal gates (including diagonal 2Q gates) before a measurement. |
RemoveResetInZeroState(*args, **kwargs) | Remove reset gate when the qubit is in zero state. |
CrosstalkAdaptiveSchedule(*args, **kwargs) | Crosstalk mitigation through adaptive instruction scheduling. |
Circuit Analysis
Width(*args, **kwargs) | Calculate the width of a DAG circuit. |
Depth(*args, **kwargs) | Calculate the depth of a DAG circuit. |
Size(*args, **kwargs) | Calculate the size of a DAG circuit. |
CountOps(*args, **kwargs) | Count the operations in a DAG circuit. |
CountOpsLongestPath(*args, **kwargs) | Count the operations on the longest path in a DAGcircuit. |
NumTensorFactors(*args, **kwargs) | Calculate the number of tensor factors of a DAG circuit. |
DAGLongestPath(*args, **kwargs) | Return the longest path in a DAGcircuit as a list of DAGNodes. |
Additional Passes
CheckMap(*args, **kwargs) | Check if a DAG circuit is already mapped to a coupling map. |
CheckCXDirection(*args, **kwargs) | Check if the CNOTs follow the right direction with respect to the coupling map. |
CXDirection(*args, **kwargs) | Rearrange the direction of the cx nodes to match the directed coupling map. |
MergeAdjacentBarriers(*args, **kwargs) | Return a circuit with any adjacent barriers merged together. |
BarrierBeforeFinalMeasurements(*args, **kwargs) | Add a barrier before final measurements. |
RemoveFinalMeasurements(*args, **kwargs) | Remove final measurements and barriers at the end of a circuit. |
DAGFixedPoint(*args, **kwargs) | Check if the DAG has reached a fixed point. |
FixedPoint(*args, **kwargs) | Check if a property reached a fixed point. |
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