Decoherence does not provide a mechanism for the actual wave function collapse; rather it provides a mechanism for the appearance of wavefunction collapse. The quantum nature of the system is simply “leaked” into the environment so that a total superposition of the wavefunction still exists, but exists — at least for all practical purposes — beyond the realm of measurement.

— Wikipedia on Quantum decoherence

There is no actual wave function collapse.

— Me@2011.12.26

2011.12.26 Monday (c) All rights reserved by ACHK