ConvertISAToClifford
class ConvertISAToClifford(*args, **kwargs)
Convert the gates of an ISA circuit to Clifford gates.
ISA circuits only contain Clifford gates from a restricted set or qiskit.circuit.library.RZGates by arbitrary angles. To convert them to Clifford circuits, this pass rounds the angle of every qiskit.circuit.library.RZGate to the closest multiple of pi/2 (or to a random multiple of pi/2 if the angle is unspecified), while it skips every Clifford gate, measurement, and barrier.
import numpy as np
from qiskit.circuit import QuantumCircuit, Parameter
from qiskit.transpiler import PassManager
from qiskit_ibm_runtime.transpiler.passes import ConvertISAToClifford
# An ISA circuit ending with a Z rotation by pi/3
qc = QuantumCircuit(2, 2)
qc.sx(0)
qc.rz(np.pi/2, 0)
qc.sx(0)
qc.barrier()
qc.cx(0, 1)
qc.rz(np.pi/3, 0) # non-Clifford Z rotation
qc.rz(Parameter("th"), 0) # Z rotation with unspecified angle
# Turn into a Clifford circuit
pm = PassManager([ConvertISAToClifford()])
clifford_qc = pm.run(qc)Raises
ValueError – If the given circuit contains unsupported operations, such as non-ISA gates.
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
__call__
__call__(circuit, property_set=None)
Runs the pass on circuit.
Parameters
- circuit (QuantumCircuit) – The dag on which the pass is run.
- property_set (PropertySet | dict | None) – Input/output property set. An analysis pass might change the property set in-place.
Return type
QuantumCircuit
Returns
If on transformation pass, the resulting QuantumCircuit. If analysis pass, the input circuit.
execute
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 (
Optional[Callable]) – A callback function which is caller per execution of optimization task.
Return type
tuple[Any, PassManagerState]
Returns
Optimized Qiskit IR and state of the workflow.
name
name()
Name of the pass.
Return type
str
run
run(dag)
Run a pass on the DAGCircuit. This is implemented by the pass developer.
Parameters
dag (DAGCircuit) – the dag on which the pass is run.
Raises
NotImplementedError – when this is left unimplemented for a pass.
Return type
update_status
update_status(state, run_state)
Update workflow status.
Parameters
- state (
PassManagerState) – Pass manager state to update. - run_state (
RunState) – Completion status of current task.
Return type
Returns
Updated pass manager state.