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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
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