34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
---
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title: coherence_limit
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description: API reference for qiskit.ignis.verification.coherence_limit
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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.coherence_limit
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---
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# qiskit.ignis.verification.coherence\_limit
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<Function id="qiskit.ignis.verification.coherence_limit" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-ignis/tree/stable/0.6/qiskit/ignis/verification/randomized_benchmarking/rb_utils.py" signature="coherence_limit(nQ=2, T1_list=None, T2_list=None, gatelen=0.1)">
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The error per gate (1-average\_gate\_fidelity) given by the T1,T2 limit.
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**Parameters**
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* **nQ** (*int*) – number of qubits (1 and 2 supported).
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* **T1\_list** (*list*) – list of T1’s (Q1,…,Qn).
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* **T2\_list** (*list*) – list of T2’s (as measured, not Tphi). If not given assume T2=2\*T1 .
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* **gatelen** (*float*) – length of the gate.
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**Returns**
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coherence limited error per gate.
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**Return type**
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float
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**Raises**
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**ValueError** – if there are invalid inputs
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</Function>
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