Imagine a foot ball ground with 7000 balls at one goal post.  We can consider this as Binary digit 1. If those 7000 balls are at other goal post, we consider that as Binary digit 0.  This is how a digital electronics based Transistor is working.

Now Imagine that we are using only one foot ball at the centre of the ground.  Now can we make this to represent a binary digit 1 or 0. If we consider that the ball has an internal rotational behavior then the upward rotation can represent one state and downward rotation can represent another state.  Being rotation, it can rotate in sideways, which can be considered as third state Superposition.