Adding ramsey sequences signal protocol

[andrea-pasquale]

Closes #673.
This protocol could be useful to run long scans without using sweepers. It might be replaced by the unrolled version #666 soon.

@GabrielePalazzo @PiergiorgioButtarini whenever you have time could test it on qblox to see if the output is the same?
Here is an example of a runcard:

actions:
    - id: ramsey
      priority: 0
      operation: ramsey_sequences_signal #ramsey_signal
      # main: single shot classification
      parameters:
        delay_between_pulses_start: 16 # must be a multiple of 4 incl 0
        delay_between_pulses_end: 200
        delay_between_pulses_step: 25 # must be a multiple of 4
        n_osc: 5

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]

Codecov Report

Merging #674 (d82adee) into main (f9dc958) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #674      +/-   ##
==========================================
- Coverage   96.05%   96.03%   -0.03%     
==========================================
  Files         106      108       +2     
  Lines        7355     7386      +31     
==========================================
+ Hits         7065     7093      +28     
- Misses        290      293       +3     

Flag	Coverage Δ
unittests	96.03% <100.00%> (-0.03%)	⬇️

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

Files	Coverage Δ
src/qibocal/protocols/characterization/__init__.py	100.00% <100.00%> (ø)
...ocal/protocols/characterization/ramsey/__init__.py	100.00% <100.00%> (ø)
...ibocal/protocols/characterization/ramsey/ramsey.py	100.00% <100.00%> (ø)
...tocols/characterization/ramsey/ramsey_sequences.py	100.00% <ø> (ø)
...characterization/ramsey/ramsey_sequences_signal.py	100.00% <100.00%> (ø)
...protocols/characterization/ramsey/ramsey_signal.py	97.16% <100.00%> (ø)

... and 1 file with indirect coverage changes

[GabrielePalazzo]

Everything seems ok to me (tested on qblox).

[stavros11]

Out of curiosity, is this only needed for doing non-detuned Ramsey with sequences without sweepers? Because last week Boulos also contacted me about a similar issue and I remember that using the existing Ramsey would fall back to sequences if I set n_osc > 0.

[andrea-pasquale]

Out of curiosity, is this only needed for doing non-detuned Ramsey with sequences without sweepers? Because last week Boulos also contacted me about a similar issue and I remember that using the existing Ramsey would fall back to sequences if I set n_osc > 0.

When he spoke to me I think that the major issue was the fact that we wanted to run long scans, therefore he needed to use the *_sequences protocol, showing on the y axis the voltages. Before this PR we were supporting only one ramsey protocol with sequences that was using probabilities and not signal. I don't know if he needs to run a detuned one or not.

[stavros11]

Yes, I think the existing ramsey_signal uses sweeper when n_osc == 0 and sequences when n_osc > 0:

qibocal/src/qibocal/protocols/characterization/ramsey_signal.py

Line 144 in 0e617fb

else:

So in the end it should be equivalent to the new routine added here for n_osc > 0.

[andrea-pasquale]

Oh yes, you are right. I will double check with @Boulos-Alfakes and I can close the PR.

[Edoardo-Pedicillo]

Thank @andrea-pasquale, LGTM

[andrea-pasquale]

I think that probably we will not need this PR. Let me close it for now and if it will be necessary I will open the PR again.