[Feature] Projector blocks

[RolandMacDoland]

Closes #193.

Few points to consider:

• Preconditions checks: bra,ket and support must be of the same length.
• qubit_support as a positional argument.
• Projector should be block_to_tensorable.
• Express N as a projector
• Integrate N in controlled blocks, i.e. Toffoli.
• Integration with PyQ

[jpmoutinho]

Thanks @Roland-djee! Looks good so far, not much to say :)

[jpmoutinho]

Thanks @Roland-djee. One thing to note is that @vytautas-a mentioned he had some issues with GPSR in his addressing pattern MR due to N not having a defined generator and generator_eigenvalues, whereas (I-Z)/2 was fine because each of those separately do have them. Maybe @vytautas-a you can take a look here to see if you think any of these changes might lead to more of those issues?

[madagra]

A few comments but looks overall good to me.

[madagra]

Looks good to me. Just check it does not generate issues with GPSR as mentioned.

[dominikandreasseitz]

i guess this MR is dependent on pasqal-io/pyqtorch#131 @Roland-djee, should we wrap up that one first

[RolandMacDoland]

i guess this MR is dependent on pasqal-io/pyqtorch#131 @Roland-djee, should we wrap up that one first

Indeed. I was waiting for the PyQ one to be merged and a new release before moving forward this one.

[dominikandreasseitz]

lgtm thanks, lets merge