Einselection
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Einselection is short for environmentally-induced superselection, a nickname coined by Wojciech H. Zurek.[1] Einselection is the quantum thermodynamic process whereby the environment persistently monitors a quantum system, causing decoherence between states of the quantum system. The decoherence process selects a certain subset of states from the enormous Hilbert space. These 'pointer states' are stable despite environmental interaction, which explains the emergence of a preferred basis in quantum measurement. The einselected states lack coherence, and therefore do not exhibit the quantum behaviours of entanglement and superposition.
Since only quasi-local, essentially classical states survive the decoherence process, einselection can in many ways explain the emergence of a (seemingly) classical reality in a fundamentally quantum universe (at least to local observers).
[edit] Definition
Zurek has defined einselection as follows "Decoherence leads to einselection when the states of the environment 
corresponding to different pointer states become orthogonal: 
"[1],
[edit] See also
[edit] References
- ^ a b Wojciech H. Zurek, Decoherence, einselection, and the quantum origins of the classical, Reviews of Modern Physics 2003, 75, 715 or [1]
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