On Tue, Dec 05, 2017 at 11:26:53AM +1100, Bruce Kellett wrote: > On 5/12/2017 3:15 am, Bruno Marchal wrote: > > I think that is enough to get the macroscopic superposition, as, like I > > explained, you have to take into account not just the quantum > > indeterminacy, + the classical chaos. You might need to shake for some > > minutes. > > You could shake for longer than the age of the universe and you will still > not convert quantum uncertainties and classical thermal motions into a > macroscopic superposition. Do you know nothing about coherence? And the fact > that coherent phases between the components are what separates a > superposition from a mixture? Random quantum uncertainties and thermal > motions are not coherent, so cannot form superpositions. >
To repeat - coherence and superposition are orthogonal concepts. A fully decohered multiverse is still in a superposition. Re the length of time for quantum uncertainty to affect macroscopic state, much less than the age of the universe is required. Whilst the StosszahlAnsatz will be strictly speaking incorrect, as I understand it it is very approximately true. This will entail that quantum randomness will affect classical randomness on about the same timescale as the mean free time of molecules in a gas at room temperature, or about 0.1 ns. Unless you are proposing some other source of randomness that is not quantum? Then I'm all ears. Classical physics doesn't have it, it is deterministic. BTW - as Brent pointed out, coin tosses many not actually be a good example of chaotic inflation of quantum uncertainty, and aren't actually a good source of randomness - fine, but clearly such systems do exist, eg lava lamps. Cheers -- ---------------------------------------------------------------------------- Dr Russell Standish Phone 0425 253119 (mobile) Principal, High Performance Coders Visiting Senior Research Fellow hpco...@hpcoders.com.au Economics, Kingston University http://www.hpcoders.com.au ---------------------------------------------------------------------------- -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
