Construct k-local ProductDual instances from 1-local ProductPOVM instances.
#105
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To achieve this we need to be able to construct the explicit tensored operators from a product frame.
It does not scale up but is still very informative to have it for small systems. Moreover, we can explicitly tensor only a part of the product operators, keeping everything efficient (e.g. going from a product of single-qubit operators to a representation of the same frame as a product of two-qubit operators).
The PR leverages the newly introduced "virtual shape" for
MultiQubitFramefrom #101. It replaces #84 (which will be closed without merging it).