---
title: ConvertISAToClifford (latest version)
description: API reference for qiskit_ibm_runtime.transpiler.passes.ConvertISAToClifford in the latest version of qiskit-ibm-runtime
source: https://quantum.cloud.ibm.com/docs/en/api/qiskit-ibm-runtime/transpiler-passes-convert-isa-to-clifford
---

# ConvertISAToClifford

*class* `ConvertISAToClifford(*args, **kwargs)`

[GitHub](https://github.com/Qiskit/qiskit-ibm-runtime/tree/stable/0.49/qiskit_ibm_runtime/transpiler/passes/cliffordization/convert_isa_to_clifford.py#L54-L114)

Bases: [`TransformationPass`](/docs/api/qiskit/qiskit.transpiler.TransformationPass)

Convert the gates of an ISA circuit to Clifford gates.

ISA circuits only contain Clifford gates from a restricted set or [`qiskit.circuit.library.RZGate`](/docs/api/qiskit/qiskit.circuit.library.RZGate)\s by arbitrary angles. To convert them to Clifford circuits, this pass rounds the angle of every [`qiskit.circuit.library.RZGate`](/docs/api/qiskit/qiskit.circuit.library.RZGate) or [`qiskit.circuit.library.RZZGate`](/docs/api/qiskit/qiskit.circuit.library.RZZGate) or [`qiskit.circuit.library.RXGate`](/docs/api/qiskit/qiskit.circuit.library.RXGate) 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.

```python
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*](/docs/api/qiskit/qiskit.circuit.QuantumCircuit)) – The dag on which the pass is run.
- **property\_set** ([*PropertySet*](/docs/api/qiskit/qiskit.passmanager.PropertySet) *| dict | None*) – Input/output property set. An analysis pass might change the property set in-place. If not given, the existing `property_set` attribute of the pass will be used (if set).

**Returns**

If a transformation pass, the resulting QuantumCircuit. If analysis pass, the input circuit.

**Return type**

[*QuantumCircuit*](/docs/api/qiskit/qiskit.circuit.QuantumCircuit)

### execute

`execute(passmanager_ir, state, callback=None)`

Execute optimization task for input Qiskit IR.

**Parameters**

- **passmanager\_ir** ([*DAGCircuit*](/docs/api/qiskit/qiskit.dagcircuit.DAGCircuit)) – Qiskit IR to optimize.
- **state** ([*DAGCircuit*](/docs/api/qiskit/qiskit.dagcircuit.DAGCircuit)) – State associated with workflow execution by the pass manager itself.
- **callback** (*Callable\[\[Task,* [*DAGCircuit*](/docs/api/qiskit/qiskit.dagcircuit.DAGCircuit)*,* [*PropertySet*](/docs/api/qiskit/qiskit.passmanager.PropertySet)*, float, int], None] | None*) – A callback function which is called per execution of optimization task.

**Returns**

Optimized Qiskit IR and state of the workflow.

**Return type**

tuple\[[*DAGCircuit*](/docs/api/qiskit/qiskit.dagcircuit.DAGCircuit), [*PassManagerState*](/docs/api/qiskit/qiskit.passmanager.PassManagerState)]

### name

`name()`

Name of the pass.

**Return type**

str

### run

`run(dag)`

[GitHub](https://github.com/Qiskit/qiskit-ibm-runtime/tree/stable/0.49/qiskit_ibm_runtime/transpiler/passes/cliffordization/convert_isa_to_clifford.py#L91-L114)

Run the pass on the DAGCircuit.

**Parameters**

**dag** (*DAGCircuit*)

**Return type**

DAGCircuit

### update\_status

`update_status(state, run_state)`

Update workflow status.

**Parameters**

- **state** ([*PassManagerState*](/docs/api/qiskit/qiskit.passmanager.PassManagerState)) – Pass manager state to update.
- **run\_state** (*RunState*) – Completion status of current task.

**Returns**

Updated pass manager state.

**Return type**

[*PassManagerState*](/docs/api/qiskit/qiskit.passmanager.PassManagerState)