QBism: an analytical review

Abstract

A new interpretation  of quantum mechanics, the interpretation which became popular in  XXI, has been taken under consideration.  This is the quantum baysinism (QBism)  which  may be taken as an extrapolation of the baysian philosophy of probability over the interpretation of quantum mechanics.  The baysian philosophy of quantum mechanics has been compared with the Copenhagen interpretation of quantum mechanics, the interpretation which can been treated as standard as it is represented in the main textbooks.  In contrast to the Copenhagen interpretation which proceeds from the triplets  – nature, apparatus  and observer (agent),  QBism emphasizes  the conscious  of the observer: the quantum state  is the observer’s  state,  and  by means of the quantum conceptual technique the observer  constructs  his/her  own image of quantum processes.  By means of measurement the observer  updates his/her  quantum state, the measuring  apparatus being  an extension of the observer’s sensuality.  From the point of the QBism’s view the phenomenon of decoherence which is widely  discussed in the contemporary literature is not essential for the theory of measurement in quantum mechanics. The decoherence explains why the macroscopic phenomena don’t expose  the interference behavior  which is characteristic for quantum superposition.

         From the historicо-philosophical point of view Qbism can be traced back to  American instrumentalism and operationalism.