Posted Nov 29, 2012 20:55 UTC (Thu) by man_ls
In reply to: Good piece
Parent article: LCE: Don't play dice with random numbers
Its hard to see (given our current knowledge of physics) how we could ever arrive at a useful definition of "randomness" that was in any way stronger than what we get by saying that "QM processes are random".
I disagree. Information theory can indeed provide a definition of randomness: a signal with maximum entropy, where each bit of the signal carries one bit of information. In a normal text different bits are correlated and therefore the information content is always less than one bit per bit of signal.
Going from there to quantum processes is not easy, but I would say that it equates to "quantum events are not correlated in time with previous events, only with states". This means that the probability of emitting a photon at any given moment is the same, regardless of the time that the photon was absorbed; only the state of the particle is relevant, not its history. Since the time when the photon is emitted is not correlated with the moment that it was absorbed, this time is random and therefore impossible to predict.
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