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In the [[Schrödinger picture]], we will always see some [[quantum superposition|superposed]] state with the ↑ amplitude gradually decreasing and ↓ amplitude increasing. More general, the moment of a transition is always [[uncertainty principle|uncertain]], and speculation such as "transition started at… and ended at…" do not have a sense. [[User:Incnis Mrsi|Incnis Mrsi]] ([[User talk:Incnis Mrsi|talk]]) 20:03, 22 September 2012 (UTC)
:The moment (on the time scale) of a transition is uncertain (Poissonian statistics for a single atom/ion). Nevertheless the time for a transition (jump) is always shorter then statistical period of jumping cycle (interval between jumps) - obtained from [[density matrix]] ("superposition"). You can see (experimental - not speculation) it in wiki reference[http://www.mpq.mpg.de/Theorygroup/CIRAC/wiki/images/8/86/Samuel.pdf] (page 3). The probability for given state is very close to 1 between jumps. It is similar as the radioactive decay. A given (long-living radioactive) nucleus is in an excited state (with probability about 1) until its decay (unpredictable when but statistically predictable from this matrix element). But it does not mean that nucleus is decaying - e.g. millions years - and that we can not say (at any time)
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