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Add conversion support for Qiskit's NoiseModels #569

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@obliviateandsurrender obliviateandsurrender commented Jul 5, 2024

Context: Add support for converting Qiskit's noise models to PennyLane's noise models.

Description of the Change:

  1. noise_models.py contains helper methods for particular things
    • Converting a Qiskit's Error object to that of a corresponding Qiskit's instructions consisting of their Pauli or Kraus representation
    • Using the above representation to map it to a corresponding PennyLane Channel's description.
    • Converting a Qiskit's NoiseModel object to a list of PennyLane Channel objects that are constructed based on the above description.
  2. converter.py contains the load_noise_model method, which accepts a Qiskit noise model along with some mentioned keyword arguments and returns the corresponding PennyLane noise model.

Benefits:
Noise model construction becomes easier and hardware noise models can be better studied.

Possible Drawbacks:

  1. Kraus representations of errors are not unique. Since Qiskit simply stores the final description in a crude way consisting either of the Pauli words or via the Kraus operators, the conversion mapping doesn't remain one-to-one and could lead to a channel corresponding to a different error but with the same canonicalized Kraus representation for the computed parameters.
  2. Readout errors are not yet supported.

Related GitHub Issues: [sc-68045]

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codecov bot commented Jul 5, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a5f0f5a) to head (53c26c1).

Additional details and impacted files
@@            Coverage Diff             @@
##            master      #569    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files            7         8     +1     
  Lines          554       734   +180     
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+ Hits           554       734   +180     

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@obliviateandsurrender obliviateandsurrender marked this pull request as ready for review July 9, 2024 14:41
@obliviateandsurrender obliviateandsurrender changed the title [WIP] Add conversion support for Qiskit's NoiseModels Add conversion support for Qiskit's NoiseModels Jul 9, 2024
Comment on lines 418 to 420
if noise_model._default_readout_error or noise_model._local_readout_errors:
warn("Readout errors are not supported currently and will be skipped.")

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@trbromley we have in the requirements that if readout noise is present, PennyLane raises an error. But, I'm wondering if raising a warning instead and skipping the readout noise makes more sense? 🤔

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A minimalistic version of this PR is implemented here.

@trbromley trbromley deleted the noise-model-convert branch July 16, 2024 14:05
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