You have to know the "phase" at which to measure the quibit, which you would need to communicate through other means. Here's some more info from a class a took

You have to know the "phase" at which to measure the quibit, which you would need to communicate through other means. Here's some more info from a class a took a couple years ago. http://www-inst.eecs.berkeley.edu/~cs191/sp12/notes/chap1&2.pdf http://www-inst.eecs.berkeley.edu/~cs191/sp12/notes/chap1&2....