Einstein's dream

We show that (in contrast to rather common opinion) QM might be not a complete theory. We present a prequantum model with the infinite dimensional phase space such that QM can be considered as an algorithm for approximation of averages with respect to prequantum fluctuations. Such an approximation is based on the asymptotic expansion of classical statistical averages with respect to a small parameter &kgr;. Therefore statistical predictions of QM are only approximative and a better precision of measurements would induce deviations of experimental averages from quantum mechanical ones. In this paper we present a natural physical interpretation of &kgr; as the time scaling parameter (between quantum and prequantum times). We analyse consequences of various choices of the prequantum time scale. Possible connections with attophysics and Grand Unification model are discussed.