On 8/7/2025 4:03 AM, John Clark wrote:
*Many quantum interpretations such as Copenhagen (but not Many Worlds)
claim there is a "Heisenberg cut", a dividing line between the quantum
world and the classical world, but it's getting harder and harder to
find where that dividing line is. At first they claimed quantum
mechanical behavior was limited to sub atomic particles but then it
was discovered that buckyballs, which are composed of 60 carbon
atoms, did too. And now in Wednesday's issue of the journal Nature
experimenters report they have detected quantum behavior in silica
nanospheres that have a diameter of 120 nm and contain approximately
_60 million atoms_, and they were able to detect it even at room
temperature. *
*
*
*I don't think the Heisenberg cut exists, I think everything behaves
quantum mechanically.*
Bohr's point was that there must be instruments and records which behave
classically, otherwise science is impossible; no one could agree on
observations. His position was that the Heisenberg cut has to exist.
Much later it was discovered that decoherence provides a mechanism for
the cut. But Bohr's point still holds. In fact surprisingly small
things, like many biological molecules behave classically.
Brent
*
*
*High-purity quantum optomechanics at room temperature
<https://www.nature.com/articles/s41567-025-02976-9>
*
*John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>*
38g
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