qml.kernels.mitigate_depolarizing_noise¶
-
mitigate_depolarizing_noise
(K, num_wires, method, use_entries=None)[source]¶ Estimate depolarizing noise rate(s) using on the diagonal entries of a kernel matrix and mitigate the noise, assuming a global depolarizing noise model.
- Parameters
K (array[float]) – Noisy kernel matrix.
num_wires (int) – Number of wires/qubits of the quantum embedding kernel.
method (
'single'
|'average'
|'split_channel'
) –Strategy for mitigation
'single'
: An alias for'average'
withlen(use_entries)=1
.'average'
: Estimate a global noise rate based on the average of the diagonal entries inuse_entries
, which need to be measured on the quantum computer.'split_channel'
: Estimate individual noise rates per embedding, requiring all diagonal entries to be measured on the quantum computer.
use_entries (array[int]) – Diagonal entries to use if method in
['single', 'average']
. IfNone
, defaults to[0]
('single'
) orrange(len(K))
('average'
).
- Returns
Mitigated kernel matrix.
- Return type
array[float]
- Reference:
This method is introduced in Section V in arXiv:2105.02276.
Example:
For an example usage of
mitigate_depolarizing_noise
please refer to the PennyLane demo on the kernel module or the postprocessing demo for arXiv:2105.02276.