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We revisit the pointer-based measurement concept of von Neumann which allowsus to model a quantum counterpart of the classical time-of-flight (ToF)momentum. Our approach is based on the Hamiltonian for a particle interactingwith two quantum pointers serving as basic measurement devices. Thecorresponding dynamics leads to a pointer-based ToF observable for theoperational momentum of the particle. We can consider single measurements ofour quantum pointers and show that this process will result in a statereduction for a single particle being downstream of the time-of-flight setup.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Pointer-based model for state reduction in momentum space