42 lines
1.8 KiB
Plaintext
42 lines
1.8 KiB
Plaintext
---
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title: gate_error
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description: API reference for qiskit.quantum_info.gate_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.quantum_info.gate_error
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---
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# qiskit.quantum\_info.gate\_error
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<Function id="qiskit.quantum_info.gate_error" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.23/qiskit/quantum_info/operators/measures.py" signature="gate_error(channel, target=None, require_cp=True, require_tp=False)">
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Return the gate error of a noisy quantum channel.
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The gate error $E$ is given by the average gate infidelity
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$$
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E(\mathcal{E}, U) = 1 - F_{\text{ave}}(\mathcal{E}, U)
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$$
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where $F_{\text{ave}}(\mathcal{E}, U)$ is the [`average_gate_fidelity()`](qiskit.quantum_info.average_gate_fidelity "qiskit.quantum_info.average_gate_fidelity") of the input quantum *channel* $\mathcal{E}$ with a *target* unitary $U$.
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**Parameters**
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* **channel** (*QuantumChannel*) – noisy quantum channel.
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* **target** ([*Operator*](qiskit.quantum_info.Operator "qiskit.quantum_info.Operator") *or None*) – target unitary operator. If None target is the identity operator \[Default: None].
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* **require\_cp** (*bool*) – check if input and target channels are completely-positive and if non-CP log warning containing negative eigenvalues of Choi-matrix \[Default: True].
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* **require\_tp** (*bool*) – check if input and target channels are trace-preserving and if non-TP log warning containing negative eigenvalues of partial Choi-matrix $Tr_{\mbox{out}}[\mathcal{E}] - I$ \[Default: True].
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**Returns**
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The average gate error $E$.
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**Return type**
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float
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**Raises**
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**QiskitError** – if the channel and target do not have the same dimensions, or have different input and output dimensions.
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</Function>
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