Being correct 50% of the time when calling heads or tails on a coin toss won’t impress anyone. So when quantum theory predicts that an entangled particle will reach one of two detectors with just a 50% probability, many physicists have naturally sought better predictions. The predictive power of quantum theory is, in this case, equal to a random guess. Building on nearly a century of investigative work on this topic, a team of physicists has recently performed an experiment whose results show that, despite its imperfections, quantum theory still seems to be the optimal way to predict measurement outcomes.
The physicists, Terence E. Stuart, et al., from the University of Calgary in Alberta, Canada; ETH Zurich in Switzerland; and the Perimeter Institute for Theoretical Physics in Waterloo, Ontario, Canada, have published their paper on the predictive power of quantum theory and alternative theories in a recent issue of Physical Review Letters.
“The fact that certain outcomes can only be predicted with probability 50% by quantum theory could in principle be explained in two very different ways,” coauthor Renato Renner of ETH Zurich told Phys.org. “One would be that quantum theory is an incomplete theory whose predictions are only random because we have not yet discovered the parameters that are relevant for determining the outcomes (and that another yet-to-be-discovered theory would therefore allow for better predictions). The other explanation would be that there is ‘inherent’ randomness in Nature. Our work excludes the first possibility. In other words, it is not only quantum theory that predicts randomness, but there is ‘real’ randomness in Nature.” More here Can quantum theory be improved?.
The main problem of quantum theory is that alwais intrepreted in the physical micro context whether it’s the wave – quantum phenomenon of light or particles. It seems no one can think that the macro-world has many wave – quantum phenomena. For example, waves on the ocean is wave – quantum phenomena, the changes of day and night is the quantum – wave phenomena such as walking, the work of the extremities, heartbeat, blood circulation, respiration, etc. are the wave – quantum phenomena. All polar phenomenon is quantum – wave formed. So there is more possibilities of improved quantum theory, but the requirement is to be free that the micro-world is the only world where occur Wave – quantum phenomena.