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Environment induced decoherence, and other quantum processes, have beenproposed in the literature to explain the apparent spontaneous selection - outof the many mathematically eligible bases - of a privileged measurement basisthat corresponds to what we actually observe. This paper describes suchprocesses, and demonstrates that - contrary to common belief - no such processcan actually lead to a preferred basis in general. The key observation is thatenvironment induced decoherence implicitly assumes a prior independence of theobserved system, the observer and the environment. However, such independencecannot be guaranteed, and we show that environment induced decoherence does notsucceed in establishing a preferred measurement basis in general. We concludethat the existence of the preferred basis must be postulated in quantummechanics, and that changing the basis for a measurement is, and must be,described as an actual physical process.

No Quantum Process Can Explain the Existence of the Preferred Basis: Decoherence Is Not Universal