How to make multiple quantum universes sound believable?

<Put my Sci-Fi thinking cap on for a moment now>
The most common issue with any trans-dimensional travel is creating a stable portal between the universes. This portal can be of the instantaneous type where one side of the portal is one universe and without any dimensional transition in-between the other side is the other universe. So as you transverse the portal you are in both at the same time. The other is the corridor type portal when you must fully exit one universe into some transition zone before entering the next. One of the main problems in creating a stable portal is power required particularly for the instantaneous kind as there is no existing substructure to the portal already. The structure of the transition zone gives a basis for the support of the portals. So you don’t have to generate all that power yourself to create the whole trans-dimensional structure you just have to find a way to tap into the already existing structure. Like just knocking down a wall or opening a door. Some plausibility can be given to the structure as something the multi-verse requires in order to maintain some form of balance. Some deliberate action in one universe translates to what appears to be some random but opposing event in another or others. <ok hat off now>



ETA:


Wormholes
http://en.wikipedia.org/wiki/Wormholes


Non-locality
http://en.wikipedia.org/wiki/Nonlocality

Bell’s theorem
http://en.wikipedia.org/wiki/Bell's_theorem

I was looking for what I remember to be Bell’s discontinuous principle but can’t seem to find it.

Many worlds interpretation of QM
http://en.wikipedia.org/wiki/Many_worlds


And of course if none of that makes your brain explode there is always

String Theory
http://en.wikipedia.org/wiki/String_theory

and

Membrane or M-theory
http://en.wikipedia.org/wiki/Membrane_(M-Theory)
 
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Technobabble. You need lots of technobabble. It can even be speculative technobabble: the characters don't need to know how it works, just that you press the button and it does. Just hide the device in a box, and provide some babble about how it works, with the caveat that the inventor was insane, no one really understands his invention, he didn't bother patenting it, since he was so confident that no one would ever duplicate it, and it explodes like a pocket nuke if you open the box. Worked with the Shipstone drive (in the story 'Waldo', and a few others by Heinlein).

A
 
Fnord said:
Kinda reminds me of a TV show where a photocopier machine sent a woman to a different universe every time she used it. Another application of the "Alternate Reality" trope.
Click to expand...
... or that most laughable of Gary Larson's cartoons where Mrs [Higgins] mistakes Professor [Herbertson's] time transporter for the washing machine. The look on her face as she scans the dinosaur strewn landscape with damp socks in hand - priceless!
 
I don't think you need to describe how the character is getting from one dimension to another: just say it's done by magic, or technology, and that's enough.

What does need to be done, though, is explaining what these separate dimensions are and why they exist.

Edit: I say this because, for instance, for most people if you tell them about an atomic bomb, and they ask, how does it work? If you answer, "It takes matter and converts it into energy." That's enough. How it does that it unnecessary. You don't even need to explain fission. So in this case I think all you have to do is explain that these separate universes exist and then say, "This (device/magic key/girl) opens a door between worlds", and of course go on to explain the rules of the device. For instance, when it works, whether or not it can control what world it goes to, if you can use it to go back to yours, if the portal stays open until it's closed, or closes by itself, etc.
And once you've decided on your rules, think out their implications, and stick to them.
 
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