[MEGA] The Analog blocks

[jpmoutinho]

The Analog blocks are an experimental functionality in Qadence that tries to create a digital-like interface for certain operations that directly compile to the Rydberg Hamiltonian. An introduction is presented in this documentation page.

This feature was a prototype, has quite a few limitations, and is currently unclear if we want to further develop it. While analog programming is important, and will for sure be a core functionality of Qadence 2, it is unlikely to be a direct move of the current implementation of the Analog blocks.

Here we reference all previous issues related to the analog blocks implementation in Qadence 1, which are now "closed as not planned":

• [Refactoring] Simplify the internal block struture for analog blocks #291
• [Refactoring, Documentation] Clarify the entangle function #290
• [Bug] Bug in the parametrisation of the phase in AnalogRot #245
• [Refactoring, DA] Better handling of analog blocks eigenvalues #239
• [Documentation] Clarify units and default values for analog parameters #238
• [Feature] Implement trainable addressing pattern weights for Pulser backend #231
• [Documentation] Clarify the role of all the amplitude and detuning maximum values #229
• [Feature] Remove same duration constraint from kronned analog blocks #226
• [Bug, DA] Limitations on AnalogRX due to the duration #150
• [Refactoring, DA, Documentation] AnalogRX's blockade radius #108
• [Refactoring, DA] More flexible analog blocks implementation #87