Ungroup Z terms

[chmwzc]

Removes the default grouping of all Z terms together when using expectation_from_samples.
Will probably add in a flag somewhere to do this optionally after some other measurement optimization schemes have been put in (e.g. the gc_to_qwc branch), but the current default is too restrictive.

Other changes:

• Edited parameters for some tests involving a bit of randomness, they should fail a lot less frequently
• Minor bug fixes in the example scripts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (43084fb) to head (7068b96).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #125   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           16        16           
  Lines          751       738   -13     
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- Hits           751       738   -13     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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[chmwzc]

@damarkian if you have time this week, could you look through this? Would be good to include it in the next minor release

[damarkian]

Thanks @chmwzc . This is for variable number of shots per observable depending on variance, right? Sorry for troubling you, but could you put the reference here in this PR, for traceability?

[chmwzc]

Thanks @chmwzc . This is for variable number of shots per observable depending on variance, right? Sorry for troubling you, but could you put the reference here in this PR, for traceability?

No, I'm still working on that😅 This is for cleaning up the code a bit before I implement other measurement optimization schemes (e.g. the gc_to_qwc branch).

[damarkian]

Alright. One step at a time then. 👌