I more-or-less take back what I said. On first reading, your comment sounded to me like you were claiming that these effects go away for large objects rather than merely becoming very hard to see. In particular, this
>When mass is something like an ordinary object, then the size of the "slits" becomes so small that we can't imagine how conduct the experiment.
I think is misleading. Experiments demonstrating quantum interference of macroscopic objects are very easy to imagine and are limited by logistical concerns rather than fundamental physics. In particular, an experiment interfering objects large enough to see with the naked eye is very likely to occur this century, so I object to calling it "unimaginable".
The de Broglie wavelength of a baseball is something like 20 orders of magnitude smaller than a proton. If you imagine this to be something that might be probed in the next few centuries, I'd be interested to hear more.
I'd be willing to bet (e.g. longbets.org) that objects of size 10^15 amu (which is large enough to be visible to the naked eye) will be interfered in this century. Baseballs are 10 orders of magnitude larger.
In any case, the point is that it's not a matter of the slits becoming too small. It's a matter of controlling environmental decoherence.
And this is one of the reasons I love HN. I would be interested in hearing more sometime. For example, if you were to write up a speculative blog post and submit it here...
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