[svan5003]

Context:
'cutoff' argument for the 'density_matrix(mu, cov, post_select, normalize, cutoff, hbar)' function from 'fock_tensors.py' is the same for all modes

Description of the Change:
Added support of the 'list' type of 'cutoff' argument for the 'density_matrix(mu, cov, post_select, normalize, cutoff, hbar)' function from 'fock_tensors.py'. It enables to perform larger simulations.
Example: 4 bosonic modes
Hilbert space dimensions 20 for each mode => ~380 GB of RAM for a density matrix.
Hilbert space dimensions 20 for 2 main and 3 for auxiliary modes => 200 MB of RAM for a density matrix.

Benefits:
Enables users to choose different Hilbert space dimensions for different modes of a density matrix. It can be helpful for simulations with a large number of modes.

Possible Drawbacks:
None

Related GitHub Issues:
None

[ziofil]

I believe this should go in the 0.23 section

[svan5003]

Ok, I will fix CHANGELOG.md

I have a question. Although I didn't change function hermite_multidimensional in _hermite_multidimensional.py, it compatible with a list cutoff by design. Should I change the documentation of this function?

[svan5003]

@ziofil, can I do something to help this change appear in the next release?

[ziofil]

@svan5003 yes, let's merge this PR :)
You should run black -l 100 thewalrus/. The rest looks ok to me. As soon as all the tests and checks are green we can merge it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (12633ca) to head (9a6fdc9).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #406   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           28        28           
  Lines         1922      1941   +19     
=========================================
+ Hits          1922      1941   +19     

Files with missing lines	Coverage Δ
thewalrus/quantum/fock_tensors.py	100.00% <100.00%> (ø)

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[svan5003]

@ziofil thanks for the feedback! I've just run the suggested command locally and committed changes. Now, it must be fine

[svan5003]

@ziofil could you please run the checks again?

[svan5003]

Hi @ziofil, is this pull request still relevant? Please let me know if any further changes are needed