Protocol to sweep CZ amplitude

[andrea-pasquale]

I added an experiment which consists in sweeping the amplitude of the CZ flux pulse to compute both CZ angle and leakage. By selecting the angle closer to $\pi$ and the leakage closer to zero it should be enough to re-calibrate a two qubit gate.

Here are a few examples: http://login.qrccluster.com:9000/Egis1uTQSYecJl1d3j26GA==/ (large sweep) http://login.qrccluster.com:9000/PWdDh9zWRwKVX6prWRAQXw== (smaller sweep)

Checklist:

• [ ] Reviewers confirm new code works as expected.
• [ ] Tests are passing.
• [ ] Coverage does not decrease.
• [ ] Documentation is updated.
• [ ] Compatibility with Qibo modules (Please edit this section if the current pull request is not compatible with the following branches).
  • [ ] Qibo: master
  • [ ] Qibolab: main
  • [ ] Qibolab_platforms_qrc: main

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.68786% with 4 lines in your changes missing coverage. Please review.

Project coverage is 97.55%. Comparing base (6961ed1) to head (5f21c6c).

Files	Patch %	Lines
...ibocal/protocols/two_qubit_interaction/cz_sweep.py	97.67%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #823      +/-   ##
==========================================
- Coverage   97.58%   97.55%   -0.04%     
==========================================
  Files         118      119       +1     
  Lines        9057     9230     +173     
==========================================
+ Hits         8838     9004     +166     
- Misses        219      226       +7     

Flag	Coverage Δ
unittests	97.55% <97.68%> (-0.04%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/qibocal/protocols/__init__.py	100.00% <ø> (ø)
...ibocal/protocols/two_qubit_interaction/__init__.py	100.00% <100.00%> (ø)
...cal/protocols/two_qubit_interaction/cz_virtualz.py	95.27% <ø> (+1.35%)	:arrow_up:
...ibocal/protocols/two_qubit_interaction/cz_sweep.py	97.67% <97.67%> (ø)

... and 2 files with indirect coverage changes

[andrea-pasquale]

I've updated the code (it is still quite a bit messy) but the it seems to be working properly.

http://login.qrccluster.com:9000/eV94CZPnQReFKNeyvq7Rxg==/

I'm already putting it as ready to review but I might try to simplfy the code later on.

[andrea-pasquale]

It could be nice to generalize it for the iSWAP gate if needed