Quadrature methods for circuit components and states

[elib20]

Context: We would like convenience methods for evaluating the quadrature basis representation of circuit components and states.

Description of the Change:

• renames the quadrature method for circuit components to quadrature_triple
• adds a new to_quadrature method to convert to the quadrature representation from Bargmann
• adds a new quadrature method for circuit components to evaluate the quadrature basis function over an array of points. This works for Bargmann and Fock representations, batched or unbatched.
• adds a new quadrature_distribution method for Ket and DM to evaluate the quadrature basis probability distribution over an array of points. This works for Bargmann and Fock representations, batched or unbatched.

Benefits:

• Convenient methods for users
• Quadrature methods now work for Fock representation

Possible Drawbacks:
None

Related GitHub Issues:

[codecov]

Codecov Report

Attention: Patch coverage is 98.41270% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.52%. Comparing base (92e42e3) to head (bc4c44c).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
mrmustard/lab_dev/circuit_components.py	95.45%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #443      +/-   ##
===========================================
+ Coverage    89.47%   89.52%   +0.04%     
===========================================
  Files          102      102              
  Lines         7365     7408      +43     
===========================================
+ Hits          6590     6632      +42     
- Misses         775      776       +1     

Files with missing lines	Coverage Δ
mrmustard/lab_dev/states/base.py	96.26% <100.00%> (+0.13%)	⬆️
mrmustard/physics/fock.py	92.94% <100.00%> (+0.38%)	⬆️
mrmustard/lab_dev/circuit_components.py	99.08% <95.45%> (-0.28%)	⬇️

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[ziofil]

Maybe it's late for this suggestions, but wouldn't it be sufficient to apply BtoQ on all wires and return the ansatz? Then the ansatz itself can be called independently.

[ziofil]

I approved it, but make sure those indices are in the right order