40 lines
1.5 KiB
Plaintext
40 lines
1.5 KiB
Plaintext
---
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title: thermal_relaxation_error
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description: API reference for qiskit.providers.aer.noise.thermal_relaxation_error
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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.providers.aer.noise.thermal_relaxation_error
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---
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# qiskit.providers.aer.noise.thermal\_relaxation\_error
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<Function id="qiskit.providers.aer.noise.thermal_relaxation_error" isDedicatedPage={true} github="https://github.com/qiskit/qiskit-aer/tree/stable/0.10/qiskit/providers/aer/noise/errors/standard_errors.py" signature="thermal_relaxation_error(t1, t2, time, excited_state_population=0)">
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Return a single-qubit thermal relaxation quantum error channel.
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**Parameters**
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* **t1** (*double*) – the $T_1$ relaxation time constant.
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* **t2** (*double*) – the $T_2$ relaxation time constant.
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* **time** (*double*) – the gate time for relaxation error.
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* **excited\_state\_population** (*double*) – the population of $|1\rangle$ state at equilibrium (default: 0).
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**Returns**
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a quantum error object for a noise model.
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**Return type**
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[QuantumError](qiskit.providers.aer.noise.QuantumError "qiskit.providers.aer.noise.QuantumError")
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**Raises**
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**NoiseError** – If noise parameters are invalid.
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## Additional information:
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* For parameters to be valid $T_1$ and $T_2$ must satisfy $T_2 \le 2 T_1$.
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* If $T_2 \le T_1$ the error can be expressed as a mixed reset and unitary error channel.
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* If $T_1 < T_2 \le 2 T_1$ the error must be expressed as a general non-unitary Kraus error channel.
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</Function>
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