If, however, we only see one outcome or the other when we look, how can we know the particle was in a superposition before we looked? The original state must be regarded as the result of a kind of superposition of the two or more new states, in a way that cannot be conceived on classical ideas. Introduction Glossary History. Specifically, the probability that the process will occur in a reversible fashion i. Quantum 3 , Wilk; Paul M. The condition of conservation of probability states that starting at any x, the total probability to end up somewhere must add up to The role of quantum coherence in non-equilibrium entropy production 01 March