Physics – Quantum Physics
Scientific paper
2009-08-04
Physics
Quantum Physics
17 pages
Scientific paper
We describe in a qualitative way a possible picture of the Measurement Process in Quantum Mechanics, which takes into account: 1. the finite and non zero time duration T of the interaction between the observed system and the *microscopic part* of the measurement apparatus; 2. the finite space size R of that apparatus; 3. the fact that the *macroscopic part* of the measurement apparatus, having the role of amplifying the effect of that interaction to a macroscopic scale, is composed by a very large but finite number N of particles. The conventional picture of the measurement, as an instantaneous action turning a pure state into a mixture, arises only in the limit where N tends to infinity, T tends to zero, R tends to infinity. The limit where N tends to infinity has been often discussed as the origin of decoherence. We argue here that, as a consequence of the Principle of Locality, before those three limits are taken, no long range entanglement between the values of observables which are spacelike separated far away can be detected (although entangled states for such observables are well known to exist in local theories, simple examples are given in an Appendix). In order to detect correlations, one of the observers has to wait until he enters the future causal shadow of the region employed by the apparatus of the other. Accordingly, in this picture of the measurement process there would be no Einstein Podolski Rosen Paradox. (Similar views had been proposed already [6], [22]). A careful comparison with the growing experimental results of the recent decades might settle the question.
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