Thanks for your comment and explanation of QM.
So what you implied is the information in superposition state is absolutely unknowable.When we measure it,it just appear 0 or 1 by chance?
And this "possiblities-attribute" of QM make no contribution to the memorizer?
This is my analysis:1)quantum can have two states at one time:0 and 1.So n QBits have the volume 2^n. 2)when it's observed,the quantum state will collapse to a certain one.
So the comtradiction is evidence:the information of the 2^n Qbits disappear when I only read n Qbits from it.
Ok...if...