I would like to check something.
Consider I am working on cQED (superconducting qubits), or ion trapped, or silicon qubits (I would like to exclude "exotic for me" quantum computing like photon based, or topological Q.C).
The fastest you perform a gate, the less the noise has the time to act for noise "per unit time" acting (not all noise can be modelled this way but it can often be).
It is thus important to perform gate "the fastest possible".
My question is thus: What is limiting gate speed ?
About limitations I know: for superonducting qubit too short pulses are not a good solution as it might excite the system into higher than qubit level (making it leave the computational space). I would like to know what are the main limitations in general because I guess this is not the only one.