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## Homework Statement

Suppose a source emits silver atoms, which are sent through

three different types of Stern-Gerlach devices, each of them is either sorting

the atoms along the x, y or z axis. If we preform a measurement along the

z or y axis, the atoms are sorted in the ” + ” direction with probability 3/8,

while if we sort along the x axis, the ” + ” direction occurs with probability

3/4.

Find the density operator of this source

Can someone help me get started? How do I find out what the source is composed of?