I read somewhere that brain is a quantum computer and is actually capable of accessing multiverse. Is this possible?
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You probably read that on the huffpost. It's the first result when I typed your question.
And because it's a huffpost and it's clickbait it's "close to the thing that is similar to truth".
The thing is that as quantum mechanics can have two states "at once" and so can your brain have two opinions on one topic at once, from what type of flavour of ice cream you want, to the answer if there is a god or not. So not physics extrapolate that "those two things are like one another" and they arrive at resolution "brain is like quantum computer".
To quote astrophysics during Conference of Polish Physicists during "quantum Technologies" sessions: Human brain is a supercomputer. But most people prefer to run Pong.