82 lines
3.0 KiB
Plaintext
82 lines
3.0 KiB
Plaintext
---
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title: gates_per_clifford (v0.29)
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description: API reference for qiskit.ignis.verification.gates_per_clifford in qiskit v0.29
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in_page_toc_min_heading_level: 1
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python_api_type: function
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python_api_name: qiskit.ignis.verification.gates_per_clifford
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---
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<span id="qiskit-ignis-verification-gates-per-clifford" />
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# qiskit.ignis.verification.gates\_per\_clifford
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<Function id="qiskit.ignis.verification.gates_per_clifford" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-ignis/tree/stable/0.6/qiskit/ignis/verification/randomized_benchmarking/rb_utils.py" signature="gates_per_clifford(transpiled_circuits_list, clifford_lengths, basis, qubits)">
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Take a list of transpiled `QuantumCircuit` and use these to calculate the number of gates per Clifford. Each `QuantumCircuit` should be transpiled into given `basis` set. The result can be used to convert a value of error per Clifford into error per basis gate under appropriate assumption.
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**Example**
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This example shows how to calculate gate per Clifford of 2Q RB sequence for qubit 0 and qubit 1. You can refer to the function `randomized_benchmarking_seq` for the detail of RB circuit generation.
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```python
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import pprint
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import qiskit
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import qiskit.ignis.verification.randomized_benchmarking as rb
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from qiskit.test.mock.backends import FakeAlmaden
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rb_circs_list, xdata = rb.randomized_benchmarking_seq(
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nseeds=5,
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length_vector=[1, 20, 50, 100],
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rb_pattern=[[0, 1]])
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basis = FakeAlmaden().configuration().basis_gates
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# transpile
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transpiled_circuits_list = []
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for rb_circs in rb_circs_list:
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rb_circs_transpiled = qiskit.transpile(rb_circs, basis_gates=basis)
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transpiled_circuits_list.append(rb_circs_transpiled)
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# count gate per Clifford
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ngates = rb.rb_utils.gates_per_clifford(
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transpiled_circuits_list=transpiled_circuits_list,
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clifford_lengths=xdata[0],
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basis=basis, qubits=[0, 1])
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pprint.pprint(ngates)
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```
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```
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{0: {'cx': 1.52,
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'id': 0.0,
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'u1': 0.14057142857142857,
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'u2': 1.7142857142857142,
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'u3': 0.1382857142857143},
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1: {'cx': 1.52,
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'id': 0.0,
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'u1': 0.11657142857142858,
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'u2': 1.776,
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'u3': 0.13942857142857143}}
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```
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The gate counts for qubit 0 (1) is obtained by `ngates[0]` (`ngates[1]`) as usual python dictionary. If all gate counts are zero, you might specify wrong `basis` or input circuit list is not transpiled into basis gates.
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**Parameters**
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* **transpiled\_circuits\_list** (`Union`\[`List`\[`List`\[`QuantumCircuit`]], `List`\[`QasmQobj`]]) – List of transpiled RB circuit for each seed.
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* **clifford\_lengths** (`Union`\[`ndarray`, `List`\[`int`]]) – number of Cliffords in each circuit
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* **basis** (`List`\[`str`]) – gates basis for the qobj
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* **qubits** (`List`\[`int`]) – qubits to count over
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**Return type**
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`Dict`\[`int`, `Dict`\[`str`, `float`]]
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**Returns**
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Nested dictionary of gate counts per Clifford.
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**Raises**
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**QiskitError** – when input object is not a list of QuantumCircuit.
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</Function>
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