Fix storage order of noise kraus ops #1825
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schweitzpgi
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Jun 26, 2024
Co-authored-by: Eric Schweitz <eschweitz@nvidia.com>
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Description
The row-major data storage was not consistently handled in our
NoiseModel.This is especially problematic for amplitude damping channel, whose Kraus matrices are not self-adjoint.
This PR:
Makes sure that we properly map flattened row-major data to Eigen matrices for validation as well as application.
Note: the base Qpp gate application has done this row-major mapping for gate matrices correctly. We need to fix the apply noise channel path.
Fixes a unit tests: these unit tests are using column-major data for amplitude damping channels, probably to make it to work with the underlying inconsistency.
Adds 'u3' as a supported gate for noise modeling. We also need to let the QIR runtime (
nvqir) propagate the gate to the simulator for the noise channel look-up to work.Makes the
py::buffer(numpy ndarray) to flattened row-major Kraus matrix mapping generic for both row and column major storage in numpy.Adds unit test.
Fixed #1811