How the result of a measurement of a component of the spin of a spin-1/2 particle can turn out to be 100 without using weak measurements

Understand

We discuss two questions related to the concept of weak values as seen from the standard quantum-mechanics point of view.

• In the first part of the paper, we describe a scenario where unphysical results similar to those encountered in the study of weak values are obtained using a simple experimental setup that does not involve weak measurements.
• In the second part of the paper, we discuss the correct physical description, according to quantum mechanics, of what is being measured in a weak-value-type experiment.