From: John K Clark (johnkc@well.com)
Date: Sat Jul 18 1998 - 23:29:48 MDT
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Eugene Leitl <eugene@liposome.genebee.msu.su> wrote:
> Two systems in the same quantum state are indistinguishable.
That's true but I certainly don't think you'd have to go as far as putting a
copy of you in the same quantum state for it to be you. That's vast overkill.
>Of course this is pretty useless, for no macroscopic objects occupy
>the same quantum state.
Still not quite macroscopic but they are getting bigger and the progress is
remarkable, the current record was set just this week by Daniel Kleppner and
Tom Greytak of MIT. They put 100 million hydrogen atoms in the same quantum
state by making a Bose Einstein condensate, what makes it even more
impressive is that it's much harder to do it with Hydrogen than with more
massive alkali atoms. That's 10 times as many atoms as the previous record
that was made just a few months ago.
John K Clark johnkc@well.com
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