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TikZ has a special option for sizing such arrows: 'double equal sign distance'
You should also use the -implies arrow style.

Here is a simple example that shows how it works:

First thanks very much for your answer.

Did you see my code ? Does this mean that i have to re-write a ' virtual ...

I need to do something with TikZ like what i shows in the attachement image.

I really get it buggy when i try.

Here the actual code i've wrote , and in the attachament what i'm trying to do

THANKS for any help



\begin{figure}[h]
\centering
\begin{tikzpicture}
[node distance=0.8cm,
start ...