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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.
SabreLayout(*args, **kwargs)Choose a Layout via iterative bidirectional routing of the input circuit.
CSPLayout(*args, **kwargs)If possible, chooses a Layout as a CSP, using backtracking.
VF2Layout(*args, **kwargs)A pass for choosing a Layout of a circuit onto a Coupling graph, as a a subgraph isomorphism problem, solved by VF2++.
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.
SabreSwap(*args, **kwargs)Map input circuit onto a backend topology via insertion of SWAPs.
BIPMapping(*args, **kwargs)Map a DAGCircuit onto a given coupling_map, allocating qubits and 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, gates_to_decompose])Expand a gate in a circuit using its decomposition rules.
UnrollCustomDefinitions(*args, **kwargs)Unrolls instructions with custom definitions.
BasisTranslator(*args, **kwargs)Translates gates to a target basis by searching for a set of translations from a given EquivalenceLibrary.

Optimizations

Optimize1qGates(*args, **kwargs)Optimize chains of single-qubit u1, u2, u3 gates by combining them into a single gate.
Optimize1qGatesDecomposition(*args, **kwargs)Optimize chains of single-qubit gates by combining them into a single gate.
Collect1qRuns(*args, **kwargs)Collect one-qubit subcircuits.
Collect2qBlocks(*args, **kwargs)Collect two-qubit subcircuits.
CollectMultiQBlocks(*args, **kwargs)Collect sequences of uninterrupted gates acting on groups of 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.
InverseCancellation(gates_to_cancel)Cancel specific Gates which are inverses of each other when they occur back-to- back.
CommutationAnalysis(*args, **kwargs)Analysis pass to find commutation relations between DAG nodes.
CommutativeCancellation(*args, **kwargs)Cancel the redundant (self-adjoint) gates through commutation relations.
Optimize1qGatesSimpleCommutation(*args, **kwargs)Optimizes 1Q gate strings interrupted by 2Q gates by commuting the components and re- synthesizing the results.
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.
TemplateOptimization(*args, **kwargs)Class for the template optimization pass.
EchoRZXWeylDecomposition(*args, **kwargs)Rewrite two-qubit gates using the Weyl decomposition.

Calibration

PulseGates(inst_map)Pulse gate adding pass.
RZXCalibrationBuilder([backend, …])Creates calibrations for RZXGate(theta) by stretching and compressing Gaussian square pulses in the CX gate.
RZXCalibrationBuilderNoEcho([backend, …])Creates calibrations for RZXGate(theta) by stretching and compressing Gaussian square pulses in the CX gate.

Scheduling

TimeUnitConversion(inst_durations)Choose a time unit to be used in the following time-aware passes, and make all circuit time units consistent with that.
ALAPSchedule(*args, **kwargs)ALAP Scheduling pass, which schedules the stop time of instructions as late as possible.
ASAPSchedule(*args, **kwargs)ASAP Scheduling pass, which schedules the start time of instructions as early as possible..
DynamicalDecoupling(*args, **kwargs)Dynamical decoupling insertion pass.
AlignMeasures([alignment])Measurement alignment.
ValidatePulseGates([granularity, min_length])Check custom gate length.

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 DAGOpNodes, DAGInNodes, and DAGOutNodes.

Synthesis

UnitarySynthesis(basis_gates[, …])Synthesize gates according to their basis gates.

Additional Passes

CheckMap(*args, **kwargs)Check if a DAG circuit is already mapped to a coupling map.
CheckCXDirection(*args, **kwargs)Deprecated: use qiskit.transpiler.passes.CheckGateDirection pass instead.
CheckGateDirection(*args, **kwargs)Check if the two-qubit gates follow the right direction with respect to the coupling map.
CXDirection(*args, **kwargs)Deprecated: use qiskit.transpiler.passes.GateDirection pass instead.
GateDirection(*args, **kwargs)Modify asymmetric gates to match the hardware coupling direction.
MergeAdjacentBarriers(*args, **kwargs)Return a circuit with any adjacent barriers merged together.
RemoveBarriers(*args, **kwargs)Return a circuit with any barrier removed.
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.
ContainsInstruction(*args, **kwargs)An analysis pass to detect if the DAG contains a specific instruction.
GatesInBasis(*args, **kwargs)Check if all gates in a DAG are in a given set of gates
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