gate_error¶
- gate_error(channel, target=None, require_cp=True, require_tp=False)[source]¶
Return the gate error of a noisy quantum channel.
The gate error \(E\) is given by the average gate infidelity
\[E(\mathcal{E}, U) = 1 - F_{\text{ave}}(\mathcal{E}, U)\]where \(F_{\text{ave}}(\mathcal{E}, U)\) is the
average_gate_fidelity()of the input quantum channel \(\mathcal{E}\) with a target unitary \(U\).- Parameters
channel (QuantumChannel) – noisy quantum channel.
target (Operator or None) – target unitary operator. If None target is the identity operator [Default: None].
require_cp (bool) – require channel to be completely-positive [Default: True].
require_tp (bool) – require channel to be trace-preserving [Default: False].
- Returns
The average gate error \(E\).
- Return type
float
- Raises
QiskitError – if the channel and target do not have the same dimensions, or have different input and output dimensions.
QiskitError – if the channel and target or are not completely-positive (with
require_cp=True) or not trace-preserving (withrequire_tp=True).