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Why can't the sender of a message just turn his system on and off to represent 0s and 1s?



He can't. It doesn't work that way. I'm not sure what you think the reciever would be able to detect if the sender did that, but there's no detectable signal.

If you provide a more detailed picture of what you're envisaging then I can probably explain exactly what's wrong with it, but please read and understand

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

and

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

along with any subordinate articles you'd need in order to understand these two, before proceeding.


The linked paper (which really is written for a layman), explains exactly that.




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