  In the present paper it will be argued that transport in a 2D electron gas
can be implemented as 'local hidden instrument based' variables. With this
concept of instrumentalism it is possible to explain the quantum correlation,
the particle-wave duality and Wheeler's 'backward causation of a particle'. In
the case of quantum correlation the spin measuring variant of the Einstein
Podolsky and Rosen paradox is studied. In the case of particle-wave duality the
system studied is single photon Mach-Zehnder (MZ) interferometry with a phase
shift size $\delta$. The idea that the instruments more or less neutrally may
show us the way to the particle will be replaced by the concept of laboratory
equipment contributing in an unexpected way to the measurement.
