Element type conversion for QuantumObject

[ytdHuang]

Support the following type conversion:

using QuantumToolbox
v = Qobj(Int64[1, 1])
m = Qobj(Int64[1, 1])

Vector{ComplexF64}(v)
Matrix{ComplexF64}(m)

and so does SparseVector and SparseMatrixCSC

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.15%. Comparing base (e59c415) to head (0c5b9cb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   91.87%   92.15%   +0.27%     
==========================================
  Files          18       18              
  Lines        1711     1721      +10     
==========================================
+ Hits         1572     1586      +14     
+ Misses        139      135       -4     

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[albertomercurio]

Great feature!

[albertomercurio]

I would say also to add the sparse command. I don't remember that this is already implemented, right?

[ytdHuang]

I would say also to add the sparse command. I don't remember that this is already implemented, right?

You mean dense_to_sparse ?

[albertomercurio]

Mmmm ok, there is already dense_to_sparse. We can merge it as it is