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== "few nanoseconds or less" ==
First, the timing depends on the energy gap value. Second, it is generally not correct to suggest a picture like
* the "↑" state before {{math|''T''<sub>0</sub>}}
* transition started at {{math|''T''<sub>0</sub>}}
* intermediate state between {{math|''T''<sub>0</sub>}} and {{math|''T''<sub>1</sub>}}
* transition ended at {{math|''T''<sub>1</sub>}}
* the "↓" state after {{math|''T''<sub>1</sub>}}.
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)
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