qutrit mixed state sampling

[Gabriel-Bottrill]

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Context: Necessary next step in qutrit_mixed device development, allows for sampling a quantum circuit on the mixed state. This will be necessary to simulate sampling a qutrit device.

Description of the Change: Added functionality for sampling a qutrit mixed-state via the new sample_state and measure_with_samples functions.

Benefits: Allows for sampling a qutrit mixed-state, allowing for noisy qutrit simulation sampling

Possible Drawbacks: Abstracting for qubits and more generally qutrits may have added challenges and will require a refactor or copied code code-smell. Methods are not the fastest possible, optimizations can still be made.

Related GitHub Issues: N/A

[Gabriel-Bottrill]

Current state of sampling PR, I could remove it and make it closer to what is in default.qutrit. I plan to cut it into two to also include expval, var, ... . This however should be a good start to get what is most necessesary while also leaving abstractions to make it easy to include other functionality.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.63%. Comparing base (a4f0fff) to head (9ee688a). Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5082      +/-   ##
==========================================
- Coverage   99.63%   99.63%   -0.01%     
==========================================
  Files         400      401       +1     
  Lines       37156    37007     -149     
==========================================
- Hits        37022    36872     -150     
- Misses        134      135       +1     

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[Gabriel-Bottrill]

@albi3ro @glassnotes @mudit2812 @trbromley I cleaned up this PR since measure is close to being merged. Hope you like it!

[Gabriel-Bottrill]

Measure has been merged, so this is ready for review.

[Gabriel-Bottrill]

Fixed broken tests. Should be good to go!

[trbromley]

Thanks! @mudit2812 do you have the ability to merge in master to the PR branch so that we can do a final round of tests?

[glassnotes]

@trbromley I just noticed your message and merged it in :+1:

[mudit2812]

Thanks! @mudit2812 do you have the ability to merge in master to the PR branch so that we can do a final round of tests?

I will check on the next PR, but I think I should as I'm part of the org that owns the fork.