bind laravel app authentican to another laravel app authentican

I have two laravel app and each has separate authentication (login), now what I want is when the user successfully login to my first laravel app (login laravel app) then the second laravel app (serve as the main app) will authenticate the current logged user (successfully login). It's some sort of a global authentication where I have single separate login laravel app to be used in login and once use has logged in to that laravel app then he can automatically logged to any other app that was bind to that login app. Any ideas, clues, suggestions, recommendations, help please?

via Chebli Mohamed