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---
title: twoQ_clifford_error (v0.31)
description: API reference for qiskit.ignis.verification.twoQ_clifford_error in qiskit v0.31
in_page_toc_min_heading_level: 1
python_api_type: function
python_api_name: qiskit.ignis.verification.twoQ_clifford_error
---
<span id="qiskit-ignis-verification-twoq-clifford-error" />
# qiskit.ignis.verification.twoQ\_clifford\_error
<Function id="qiskit.ignis.verification.twoQ_clifford_error" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-ignis/tree/stable/0.6/qiskit/ignis/verification/randomized_benchmarking/rb_utils.py" signature="twoQ_clifford_error(ngates, gate_qubit, gate_err)">
The two qubit Clifford gate error given measured errors in the primitive gates used to construct the Clifford (see arxiv:1712.06550). Assumes the error in the underlying gates is depolarizing.
**Parameters**
* **ngates** (`Dict`\[`int`, `Dict`\[`str`, `float`]]) list of the number of gates per 2Q Clifford.
* **gate\_qubit** (`List`\[`int`]) list of the qubit corresponding to the gate (0, 1 or -1). -1 corresponds to the 2Q gate. Note that 0 (1) corresponds to the single qubit gate counts in `ngates` which has smaller (larger) qubit index.
* **gate\_err** (`List`\[`float`]) list of the gate errors.
<Admonition title="Note" type="note">
This function presupposes the basis gate consists of `u1`, `u2`, `u3` and `cx`.
</Admonition>
**Returns**
Error per 2Q Clifford.
**Return type**
float
**Raises**
**QiskitError** when number of qubit contained in `ngates` is not 2.
</Function>