CP Instruments & Instrument Error Generators

[pcwysoc]

Parameterize the quantum instrument using the 'auxiliary picture' in order to access a CPTPLND parameterization and a notion of error generators.

• [x] Create the class
• [x] Implement probabilities
• [x] Implement dprobs
• [x] Verify that GST is performed correctly, with the estimate fitting the data well
• [x] Implement gauge optimization
• [x] Fix the deriv_wrt_params issue by adding a submember class
• [ ] Implement error bars
• [ ] Ensure report generation works correctly
• [ ] Add error generators to report
• [ ] Fix #453
• [ ] Make it go fast!
• [ ] Long-term: Figure out Instrument/InstrumentOp infrastructure (likely spawn off as a new issue once we know what we want)
• [ ] Long-term: Figure out user-defined/automagical isometry specification